Aakash Institute 24 A light of wavelength 5000A is coming
Last updated: 6/24/2023
Aakash Institute 24 A light of wavelength 5000A is coming from distant star What is the limit of resolution of a telescope whose objective has a diameter of 200cm 1 3 05 x 10 7rad 2 6 6 x 10 7rad 3 8 x 10 7rad 4 2 23 10 rad 25 A poloroid sheet and an analyzer are placed such 30 that their transmission axes are parallel The analyzer is then rotated by 22 5 What is the intensity of the transmitted light as a fraction of intensity of light incident on analyser 1 0 45 2 0 68 4 0 87 3 0 41 26 The observed wavelength of light coming from a distant galaxy is found to increase by 0 5 as compared with that coming from a terrestrial source The galaxy is 1 Stationary with respect to earth 2 Approaching earth with a velocity of 1 5 10 m s 3 Receding from earth with velocity of light 4 Receding from earth with a velocity equal to 1 5 x 108 m s 27 In young double slit experiment D equals the distance of screen from slits and d is the separation between the slits The distance of the nearest point to the central maxima where intensity is same that due to a single slit is equal to DA 1 3 1 DX 3d Telegram reetque s double slit experiment is performed with light of wavelength 5000 A If a glass plate of thickness 1 m and refractive index 1 5 is kept in front of one of the slits then number of fringes that passes through the field of view is 1 1 3 3 2 2 4 4 4 34 In YDSE distance between two slits is 4 mm D 1 m and 12000 A If intensity of coherent light from two slits are l and 16 l then find intensity at y 0 1 mm on the screen 28 Consider the arrangement shown in figure The distance D is large compared to the seperation d between the slits A monochromatic beam of light of wavelength falls on the slit as shown Find the 1 7 2 10 4 16 3 13 distance x at which the first order bright fringe is 35 Two polarising sheets are placed with their planes formed parallel so that light intensity transmitted is maximum Through what angle must either sheet be turned so that light intensity drops to half the maximum value Incident ray 3 AD 2 I 2 DX 2d 2 D d D 2 D d screen AD d 3 4 29 Angular width of central maximum in the Wave Optics illuminated by the light of wavelength 6000 A If slit is illuminated by light of another wavelength angular width decreases by 30 wavelength of light used is 32 1 3500 A 2 4200 A 4 6000 A 3 4700 A A person with normal vision can just resolve two poles separated by a distance of 10m If the limit of resolution be 1 then the distance of the poles from the person is 1 34 km 3 34 m 2 3 4 km 4 3 4 m 31 A ray of light is incident on the surface of a glass plate of refractive index 3 at the polarising angle The angle of refraction is 1 60 3 45 When a thin film is illuminated by a parallel beam light of wavelength 6000 A of 7 fringes are observed in a certain region of the film How many fringes will be observed in the same region of the film if light of wavelength 4200 A is used 1 6 1 30 3 60 2 30 4 50 36 The intensity ratio H 2 10 4 18 2 45 4 90 of the two interfering waves in a Young s experiment is 4 The ratio resulting wave is 1 4 1 2 2 1 min in