# Geometrical Optics Questions and Answers

Physics
Geometrical Optics
What is the energy of a photon with a frequency of 3 17x1011 Hz 2 09 10 23J 4 78x1044J 2 09x10 45J 2 10x10 22j
Physics
Geometrical Optics
A 5 00 cm tall object is placed 4 25 cm from a lens and produces an image that is 3 00 cm behind the lens What is the height of the image formed 3 53cm 3 53cm 7 10cm 7 10cm
Physics
Geometrical Optics
A 3 25 cm tall object is placed 7 20 cm from a converging lens An image is produced that is 12 5 cm in front of the lens A What is the focal length of the lens B Calculate the magnification of the lens C Is the image Real or Virtual D Is the image right side up or upside down
Physics
Geometrical Optics
An object is placed 21 3 cm from a convex lens An image is produced at 27 5 cm What is the focal length in cm of the lens 1 2 1 2 F do di Remember that a negative d means that the image is produced behind the lens you still use the same equation in the same way Round your answer to the nearest 0 1 Do not add units
Physics
Geometrical Optics
A person with a digital camera uses a lens of focal length 25.0 mm to take a photograph of a 1.24-cm -tall seedling located 12.0 cm from the camera. Part A How far is the camera's lens from its CCD sensor chip? Express your answer in centimeters.
Physics
Geometrical Optics
A thin lens with a focal length of 6.50 cm is used as a simple magnifier. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of A simple magnifier. Part A What angular magnification is obtainable with the lens if the object is at the focal point? M =
Physics
Geometrical Optics
An object is placed at a distance of 50 cm from a plane and a concave mirror with f=40 cm. Therefore the conclusion we can make on the images formed as O both are real and upright images O one is real and upright whereas the other is virtual and inverted O both are virtual and upright images O one is virtual & upright whereas the other is real and inverted
Physics
Geometrical Optics
9. Coulomb force between the nucleus (with atomic number Z) and an electron at an orbit of radius r = Ze²/r² 10. Assuming the nucleus being at rest, total energy of an atom E= - kee²/2r) Energy levels (En) for electrons at different stable orbits, En = -(meke2e4/2h²n²), h=h/2π. En = -(13.6/n²)eV 11. Proton mass mp = 1.007825 unit, neutron-mass mn = 1.008665 unit. Mass-energy equivalence: 1 unit converts to 931.5 MeV/c² 12. For radioactive decay, ΔN/Δt = -λt, N→ nuclei not decayed. Half-life T1/2= 0.693/λ, λ→ decay constant 13. 1 u of mass=931.5 MeV of energy Question 8 An object is placed at a distance 6 cm in front of a concave mirror with f = 15 cm. What is the magnification? (use the absolute values) 2.9 1.7 2.5 3.0
Physics
Geometrical Optics
If the magnification of an image formed by a concave mirror is negative, the image must be A. inverted B. real C. any of the choices mentioned here D. formed away from the focus
Physics
Geometrical Optics
A monochromatic light source emits a wavelength of 500 nm in air. When passing through a liquid, the wavelength reduces to 474 nm. What is the liquid's refractive index? A. 1.60 B. 1.05 C. 2.11 D. 1.49
Physics
Geometrical Optics
Calculate the recessional velocity in m/s of a light wave with a red-shift (Δλ/λ0) of .02. Assume the speed of light (c) to be 3x10^8 m/s.
Physics
Geometrical Optics
A delicious looking Popeye's biscuit is placed 3 cm from a DIVERGING lerip which forms an image at 5 cm. Calculate the focal length of the lens.
Physics
Geometrical Optics
An image formed by a concave mirror is mostly (except for cases when the object is placed too closed to the mirror) real and straight / erect virtual and straight virtual and inverted real and inverted
Physics
Geometrical Optics
Light of wavelength 710 nm in vacuum passes through a piece of quartz of refractive index of 1.458. (a) Find the speed of light in quartz. (b) What is the wavelength of this light in quartz? O 2.06 x 108 m/s, 487 n m O 6.02 x 108 m/s, 189 n m O 2.06 x 108 m/s, 870 n m O 206 x 10® m/s,800 nm
Physics
Geometrical Optics
A 1.74 m tall person stands in front of a mirror and sees only the upper half of his body image formed by the mirror. What is the height of the mirror? 87.0 cm 43.5 cm Height of the mirror depends on how far the person is standing from the mirror. 65.0 cm
Physics
Geometrical Optics
A block of cubic zirconia is placed in water. A laser beam is passed from the water through the cubic zirconia. The angle of incidence is 50°, and the angle of refraction is 27°. What is the index of refraction of this cubic zirconia? Water's refractive index is 1.33.
Physics
Geometrical Optics
If the object distance for a converging thin lens is more than twice the focal length of the lens, the image is 1. virtual and erect. 2. larger than the object. 3. located at a distance between f and 2 f from the lens. 4. located inside the focal point. 5. located at a distance more than 2 f from the lens.
Physics
Geometrical Optics
A physics student places an object 6.0 cm from a converging lens of focal length 9.0 cm. What is the magnitude of the magnification of the image produced? 1. |M| = 3.0 2. |M| = 3.6 3. |M| = 0.6 4. |M| = 2.0 5. |M| = 1.5
Physics
Geometrical Optics
A 16 cm high object is in front of a thin lens. The object distance is 3 cm and the image distance is -8 cm. The image height is: ○ 1. -6 cm 2. -42.6667 cm 3. -21.3333 cm 4.-1.5 cm 5. -0.666667 cm
Physics
Geometrical Optics
An object is 30 cm in front of a converging lens of focal length 10 cm. The image is: 1. virtual and the same size than the object. 2. real and smaller than the object. 3. real and the same size than the object. 4. virtual and smaller than the object. 5. real and larger than the object.
Physics
Geometrical Optics
Magnifying mirrors are usually concave because concave mirrors a) form a virtual image that is in front of the mirror b) form a virtual image that is larger than the actual object c) can form either a virtual or a real image d) form a virtual image that is smaller than the actual object
Physics
Geometrical Optics
If light moves through a particular material at 1.5x108 m/s, what is the material's refractive index (n)? Use the equation in your notes. Round your answer to the nearest 0.01.
Physics
Geometrical Optics
The process by which the lens adjusts its shape to focus images at various distances on the retina is called A. accommodation B. feature detection C. adaptation D. shape detection
Physics
Geometrical Optics
When people usually think about telescopes, they think about visually looking at distant objects with their eyes. But, not all telescopes use the visible portion of the electromagnetic spectrum. Some use radio waves, infrared,... O True O False
Physics
Geometrical Optics
A convex lens 'L' and a plane mirror 'M' are arranged as shown in figure below. Position of object pin 'O' is adjusted in such a way that the inverted image 'I' formed by the lens mirror combination, coincides with the object pin 'O'. Explain how and when this happens :
Physics
Geometrical Optics
A 2.7-cm-tall object is 100 cm in front of a diverging lens that has a 51 cm focal length. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper with a grid Determine the image distance by making measurements on your diagram. Express your answer in centimeters to two significant figures. Enter positive value if the image is on the other side from the lens and negative value if the image is on the same side.
Physics
Geometrical Optics
For the following lens, locate the image by drawing a ray diagram (3 rays) and describe the image as (inverted or upright, real or virtual, magnified or reduced). Converging lens a. Upright, virtual, reduced b. inverted, real, magnified C Inverted, virtual, magnified d. Upright, real, reduced
Physics
Geometrical Optics
An object is 20.1 cm from the surface of a reflective spherical Christmas-tree ornament 3.07 cm in radius. What is the apparent position of the image? What is the magnification of the image?
Physics
Geometrical Optics
All of the following images can be formed by a converging lens except which one? Select one: a. virtual, upright, and magnified b. real, inverted, and magnified c. real, inverted, diminished d. real, upright, and magnified
Physics
Geometrical Optics
You wish to photograph the image of your little sister, who is standing 2 meters from a plane mirror. Holding the camera beside her head, you should set the distance for Select one: a. 3 meters. b. 2 meters. c. none of these d. 4 meters. e. 1 meter.
Physics
Geometrical Optics
Which two traits are characteristic of materials in which light travels relatively fast? a. They have a low index of refraction value are NOT very optically dense. b. They have a high index of refraction value are very optically dense. c. They have a high index of refraction value are NOT very optically dense. d. They have a low index of refraction value are very optically dense.
Physics
Geometrical Optics
Light is not refracted when it is Select one: a. traveling from water into air at an angle of 35° to the normal. b. striking a wood surface at an angle of 75°. c. traveling from air into a diamond at an angle of 45°. d. traveling from air into a glass of water at an angle of 35° to the normal.
Physics
Geometrical Optics
A 3.0 cm tall object is placed in front of a convex mirror with a focal length of 5.0 cm. (A) If the object is 7.0 cm in front of the mirror what is the position of the image? (B) What is the height of the image? (C) Is the image real or virtual? (D) Is the image upside down or right-side up?
Physics
Geometrical Optics
An apple is placed 21 cm from a convex lens with a focal length of 15 cm. A -8.6 cm tall image is produced at 29.2 cm. How tall is the apple? Round your answer to the nearest 0.1. Do not add units!
Physics
Geometrical Optics
A convex lens with a focal length of 6.8 produces an image at -48 cm. How far away is the object placed? Remember that a negative di means that the image is produced behind the lens-you still use the same equation in the same way! Round your answer to the nearest 0.1. Do not add units!
Physics
Geometrical Optics
A 8.9 cm tall apple is placed 26.2 cm from a convex lens with a focal length of 15 cm. An image is produced at 52.6 cm. How tall is the image? Remember that an inverted image has a negative hi! Round your answer to the nearest 0.1. Do not add units!
Physics
Geometrical Optics
An object is placed 15.6 cm from a convex lens. An image is produced at -57.6 cm. What is the focal length (in cm) of the lens? Remember that a negative di means that the image is produced behind the lens you still use the same equation in the same way! Round your answer to the nearest 0.1. Do not add units!
Physics
Geometrical Optics
An image is produced by a concave lens. The image is virtual, upright, and smaller than the object. How far away is the object? farther than 2F closer than F position doesn't matter at 2F at F between 2F and F
Physics
Geometrical Optics
A 3.0 cm tall object is placed 4.00 cm in front of a lens. An image is produced that is 6.0 cm and also in front of the lens. A. What is the focal length of the lens? B. What is the magnification of the lens? C. Is the image real or virtual? D. Is the image upside down or right-side up?
Physics
Geometrical Optics
A light ray incident along vector 2i+4j+ √5k strikes on the x-z plane from medium-I of refractive index 2 and enters into medium-Il of refractive index μ₂. The value of μ₂ for which the ray is just totally reflected from the boundary, is 5/4 6/5 3√3/5 8
Physics
Geometrical Optics
A real image is formed 25.0 cm from a mirror. The image is inverted and is 0.25 times the size of the object. What is the focal length of the mirror? What is the object distance? What type of mirror was used?
Physics
Geometrical Optics
A 142 cm tall person stands 250 cm from a camera, which has a 15.0 cm focal length lens. How big is the image of the person on the film? (Mind your minus signs.) (Unit = cm)
Physics
Geometrical Optics
The Galenian telescope below has a total length of 18cm. Assuming a magnification of 10x, determined the focal lengths of the objective and the eyepiece. How long would a Keplerian telescope need to be to provide the same magnification using the same objective lens.
Physics
Geometrical Optics
Two lenses are separated by 25 cm. the first lens has a focal length of 9 cm and the second lens has a focal length of 10 cm. If a 2 cm object is placed 17 cm in front of the first lens, calculate the location (relative to the second lens) and the magnification of the final image. Is the final image real or virtual? Is the intermediate image real or virtual?
Physics
Geometrical Optics
You are working on a physics problem to determine the focal length of a lens. In solving the problem, you find the focal length, f, to pe positive. Assuming this is correct, this means that All images formed by this lens must be real images All images formed by this lens are upright The lens is a converging lens All images formed by this lens can be captured on a screen All images formed by this are magnified
Physics
Geometrical Optics
A convex mirror is fomed from a portion of a sphere with a diameter of 16.4 cm. An object is placed in front of the mirror and the image distance is -3.35 cm. a) What is the focal length of the mirror? b) What is the object distance? A. f = 8.20 cm B.f = -8.20 cm C.f = 4.10 cm D.f = -32.8 cm E. f none of these answers F. Do = 3.73 cm G. Do = 1.84 cm H. Do = 2.38 cm 1. Do = 5.66 cm J. Do none of these answers
Physics
Geometrical Optics
A diverging lens with a focal length |f|=20cm is placed 10cm to the right of a converging lens with a focal length of |f|=24 cm. An object is placed 96cm to the left of the converging lens. i) Determine the position of the final image. ii) Determine the total magnification of the final image. iii) Is the image real or virtual.
Physics
Geometrical Optics
Light with a wavelength of 654 nm falls on double slits of width a, a distance d apart. The 8th order interference minimum is 11.8 cm from the central maximum on a screen 4.92 m away. The 2nd order diffraction minumum is at an angle of 1.78" a) What is the distance d? b) What is the width a?
Physics
Geometrical Optics
To determine the depth of a swimming pool filled with water, we are given the width of the pool which is 6.50 m. If the far bottom edge of the pool is just visible at an angle of 17.0°above the surface, what is the pool depth?
Physics
Geometrical Optics
A convex lens of focal length fis placed in front of a screen. A point source of light is placed at some distance, (f< d < 4f) from the screen. A circular spot of light is formed on the screen. The lens is moved between source and screen starting from the position of source, then As lens is moved away from source towards screen, size of spot remains constant As lens is moved away from source towards screen, size of spot decreases continuously As lens is moved away from source towards screen, size of spot keep on increasing As lens is moved away from source size of the spot first decreases then increases