Optical Instruments Questions and Answers

The ray diagram shows a candle that is placed between the focal point and the mirror Which best describes the image that will be produced compared with the object F Object O It will be smaller and upright OIt will be smaller and inverted It will be larger and upright It will be larger and inverted

The k in Coulomb s law is the proportionality

A nearsighted eye has a far point of 100 cm Objects further than 100 cm are not seen clearly A diverging lens is used to permit clear vision of an object placed at infinity Find the focal length of the lens 3p

When a light ray passes from a material in which it is traveling relatively slow into a material in which it travels faster the light ray will bend Select one O a away from the normal line O b in whichever direction it feels like O c toward the normal line

If an object is located 8 meters in front of a plane mirror then the image is located Select one O a 4 Ob 8 O C O d 12 16 Oe none of these meters from the object

8 The diagrams below show light traveling from water A into another material B Using the chart label material B for each diagram as helium water Material Helium Water Index of Refraction n 1 00004 Emerald Cubic Zirconia emerald or cubic zirconia Water Normal A B Water Normal 1 33 1 58 2 17 A B Water Normal A B Water Normal A B

The diagrams below show a microscopic view of light rays reflecting off a surface L Diagram A Diagram B Which one of the diagrams best depicts the phenomenon of diffuse reflection Diagram C Diagram D

Which best describes the surface of a concave mirror O It is flat O It is textured O It curves outward OIt curves inward How is an image produced by a plane mirror different than an image produced by a convex mirror OIt is smaller than the object OIt is the same size as the object O It is inverted O It is upright

61 Describe the path of light through the eye You may list the structures with arrows in between to indicate the path Be sure to include the sensory receptors

If the object distance for a converging thin s is more than twice the focal length of the s the image is 1 located inside the focal point 2 located at a distance between f and 2 f from the lens 3 virtual and erect 4 larger than the object 5 located at a distance more than 2 f from the SUBMI

An object is placed in front of a thin lens It ms a virtual image which is twice as large the object The object distance is a Find the focal length 1 f 4 a 2 f 3a 3 f 2 a 4 f 3 a 5 f 2 a 6 f a 7 f 4a

B C E Label the above diagram with p q h and h Be sure to mark them with or s the image real or virtual Why Vill the magnification be a positive or negative number Will the magnification be greater than or less than 1

Ray tracing for len A pencil is placed near a converging lens as shown 1 On the diagram below Determine the location and orientation of the image by drawing at least two principal rays from both the tip and eraser of the pencil Summarize the nature real virtual orientation upright inverted and size larger smaller same of the image 4 a If you want to make the image larger should you move the object slightly closer to the lens or slightly further from the lens If the size of the image is fixed state so explicitly Draw a ray diagram as part of your explanation 4

Date completed Read the section in your Physics textbook or verified resource that discusses the law of refraction of light and the critical angle Complete the problems on this sheet and submit it before proceeding with the experiment Your name 1 Describe how you would determine the ratio of the velocity of light in water to the velocity of light in glass using geometrical optics 2 Draw a diagram to show how a converging lens can be used as a magnifying lens 3 Draw a diagram to illustrate total internal reflection

5 4 points total While the index of refraction of a material is a constant it varies slightly based on the wavelength color of light This phenomenon is known as dispersion and is the reason a glass prism is able to separate white light into a spectrum of colors The plot at right shows how the index of refraction of a typical glass ng 1 5 varies for the visible wavelengths a Index of refraction n 1 50 1 45 350 1 5 points On the figure at right white light is incident on a triangular glass prism which separates the white light into a spectrum The three rays shown represent blue red and green light Indicate which of these three rays is which color Explain your reasoning using the plot above 450 550 650 Wavelength nm 750 b 1 point When it is in glass does red light travel faster or slower than blue light Explain c 1 5 points How far would light need to travel in a glass cable for the faster color to arrive at the end one microsecond ahead of the slower color Show your work and explain

The object is 12 cm from a convex lens that has a focal length of 5 cm Is the lens convergent or divergent Real or virtual focal point Find the distance to the image Positive or negative focal length

A deep sea fisherman hooks a big fish that swims away from the boat pulling the fishing line from his fishing reel The whole system is initially at rest and the fishing line unwinds from the reel at a radius of 4 50 cm from its axis of rotation The reel is given an angular acceleration of 110rad s 2 for 2 00 s how many revolutions does the reel make Round off answer to nearest integer Blank 1 rev

A nylon rope used by mountaineers elongates 1 2 m under the weight of a 63 kg climber If the rope is 48 m in length and 6 9 mm diameter what is Young s modulus for nylon Round your answer to 2 decimal places

An image is produced by a convex lens The image is real inverted and smaller than the object How far away is the object O at F O farther than 2F O between 2F and F O at 2F O position doesn t matter O closer than F

3F 2 3 0 5 02 0 3 01 2F F Lens F 2F Optical Axis TI 3F Where could you place an object so that the image produced would be real inverted and smaller than the object

HTT 3F 2 3 Select TTT 2F 5 F Lens F If an object is placed at location 1 the image formed will be Select Select 2F Optical Axis 3F and

Two converging lenses are available to make a simple telescope One has a focal length of 63 0 cm and the other has a focal length of 7 00 cm What distance should the two lenses be separated by and what would be the angular magnification this telescope could provide Select one O a O b O C O d L 56 0 cm L 70 0 cm L 70 0 cm L 56 0 cm Me 9 0 x Me 9 0 x Me 7 0 x Me 7 0 x

03 OF 04 Lens 2F Optical Axis Where could you place an object so that the image produced would be real inverted and smaller than the object 3F

What is the speed of light in a medium with an index of refraction n 1 95 1 54x108 m s 6 50x107m s 4 95x108 m s

What is the reading of the micrometer shown in the figure below 1 mm 8 28 mm 5 12 mm 16 12 mm 5 8 mm 8 12 mm 15

3 What type of aberration is shown below Explain your answer in a sentence or more

3 What did you need to do before viewing the slide at 100x Part D Determining the Field of View https depts washington edu vurchin index php view main Under microscope basics select microscope measurement Complete the introduction field of view and calibrate sections Procedures 1 Follow the steps from the activity 2 Determine how many millimeters are in the field of view under 4X 10X 40X 3 Draw each field of view and write the number of millimeters Objective 4X Objective 10X Objective 40X

How far apart must the slits be to produce a 2nd order dark fringe at an angle of 1 830 when struck by light with a wavelength of 6 70x107m 4 20x10 5m 9 15x10 7m 7 32x10 7m 000

A 7 50 cm tall object is placed 8 75 cm from a convex mirror with a focal length of 3 00 cm A Calculate the location of the image B Calculate the height of the image C Is the image real or virtual D Is the image right side up or upside down

What is the angle of the 2nd order bright fringe produced by two slits that are 8 25x105m apart if the wavelength of the incident light is 4 50x 91 7 0 0109 1 60 0 625 OOOO

Light can be shown to have the property of rectilinear propagation. How did Newton explain this phenomenon using his particle theory? [C=2]

A divergent lens forms a virtual image 0.54 times the size of the object. The object dis- tance is 19.5 cm . Scale: 10 cm Find the distance of the focal point from the center of the lens. Answer in units of cm.

A compound microscope of tube length 200mm, magnifying power 400 has objective of focal length 10mm. The focal length of eye-piece will be (under normal adjustment) 250/19 mm 200/19 500/19 150/19

What is the minimum diameter mirror on a telescope that would allow you to see details as small as 4.90 km on the Moon some 384,000 km away? Assume an average wavelength of 540 nm for the light received.

A pond of water is 5m deep. The flame is held 2m above the surface of water. A fish is at depth 4m from water surface. The refractive index of water is 4/3. The apparent height of flame from the eyes of fish is Correct Answer A. 8/3m B. 6m C. 5.5m D. 20/3m

At what angle should a ray of light be incident on the face of a prism of refracting angle 60° so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is 1.524.

A point object is kept between a plane mirror and a concave mirror facing each other. The distance between the mirrors is 22.5cm . Plane mirror is placed perpendicular to principal axis of concave mirror. The radius of curvature of the concave mirror is 20cm. What should be the distance of the object from the concave mirror so that after two successive reflections the final image is formed on the object itself? (Consider first reflection from concave mirror) A. 5cm B. 15cm C. 10cm D.7.5cm

The sun subtends an angle of 1.2 on the earth. The image of sun is obtained on the screen with help of a convex lens of focal length 100 cm the diameter of the image obtained on the screen will be:

The human eye can readily detect wavelengths from about 400 nm to 700 nm. (a) If white light illuminates a diffraction grating having 710 lines/mm, over what range of angles does the visible m = 1 spectrum extend? Enter the smallest angle in degrees in the blank below:

A concave mirror of radius of curvature 60 cm is place at the bottom of tank containing water up to a height of 20 cm. The mirror faces upwards with its axis vertical Solar light fall normally on the surface of water and the image of the of the sun is formed. If aµw= 4/3 then with the observer in air, the distance of the image from the surface of water is 30 m 10 m 7.5 cm above 7.5 cm below

A point object is placed midway between two plane mirrors a distance apart. The plane mirrors form an infinite number of images due to multiple reflections. The distance between nth order images formed in the two mirrors is A. na B. 2na C. 0.5na D. n² a

Two plane mirrors are combined to each other as such one is y-z plane and other is in x-z plane. A ray of light along vector i+j+k is incident on the first mirror. The unit vector in the direction of emergence ray after successive reflections through the mirror is?

Which of the following is true of a concave lens? Choose all that apply. always produces images larger than the object is a diverging lens always produces virtual images can sometimes produce a virtual image can sometimes produce a real image is a converging lens always produces real images always produces images smaller than the object

Anna holds a 11 D magnifier directly in front of her eye to get a close look at a 19-mm -diameter penny. Assume a typical 25 cm near point and a distance of 1.7 cm between the lens and the retina. Part A: What is the closest possible distance that she can hold the coin to have it appear in focus? Express your answer with the appropriate units. Answer: 6.7 cm Part B: At this distance, how large does the image of the coin appear on her retina? Express your answer with the appropriate units.

Identify the term that matches the following description. Select the best answer. a type of eating disorder characterized by binge eating followed by purging bulimia nervosa anorexia nervosa binge eating disorder

A lensmaker has an order for a prescription eyeglass with an optical power of +3.30 diopters. He grinds the lens from a "blank" that has a refractive index of 1.56. If the radius of curvature of the convex front surface is 32.0 cm, what should the radius of curvature of the other surface be?

Two convex lenses are placed 15.0 cm apart. They both have focal lengths equal to 24.0 cm. If an object is located 30.0 cm in front of one of the lenses, where would the final image be formed by the second lens? Calculate the total magnification.

Which of the following was not a composer? A. William Byrd B. Josquin des Prez C. Andrea Amati D. Thomas Morley

A person of age 40 is fitted with bifocals with a strength of +1 diopter more than the correction for distance vision. What are the closest and farthest distances of focus without the bifocal lens and with it? By the time the person is age 50, what are they with and without the same lens?

In Young's double slit experiment, using monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If the screen is moved by 5 x 10-²m towards the slits, the change in the fringe width is 3 x 10-5m. If the distance between the two slits is 10-³m, calculate wavelength of the light used.