Which one of the following spherical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are as given in the diagrams

                 

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The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image is at a distance of 26 cm from the convex lens, calculate the new size of the image.

(a) 1.25 cm                              (b) 2.5 cm

(c) 1.05 cm                              (d) 2 cm

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An achromatic prism is made by crown glass prism Ac=19° and flint glass prism AF=6°. If μvC=1.5 and μvF=1.66, then resultant deviation for red coloured ray will be

(a) 1.04°                     (b) 5°

(c) 0.96°                      (d) 13.5°

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An isosceles prism of angle 120° has a refractive index of 1.44. Two parallel monochromatic rays enter the prism parallel to each other in air as shown. The rays emerging from the opposite faces :

                               

(a) Are parallel to each other

(b) Are diverging

(c) Make an angle 2sin-10.72 with each other

(d) Make an angle 2sin-10.72-30° with each other

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A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. If μ is the refractive index of the material of the prism, the maximum value of the base angle for which light is totally reflected from the hypotenuse is 

(a) sin-11μ                             (b) tan-11μ

(c) sin-1μ-1μ                         (d) cos-11μ

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Total internal reflection
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A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30 cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm. Then the refractive index of its material will be 

(a) 3.0                                (b) 2.0

(c) 2.5                                (d) 1.5

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A ray of light travels from an optically denser to rarer medium. The critical angle for the two media is C. The maximum possible deviation of the ray will be

(a) π2-C                          (b) 2C

(c) π-2C                             (d) π-C

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Total internal reflection
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An astronaut is looking down on earth's surface from a space shuttle at an altitude of 400 km. Assuming that the astronaut's pupil diameter is 5 mm and the wavelength of visible light is 500 nm. The astronaut will be able to resolve linear object of the size of about 

(a) 0.5 m                    (b) 5 m

(c) 50 m                      (d) 500 m

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Resolution of Optical devices
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The average distance between the earth and moon is 38.6×104 km. The minimum separation between the two points on the surface of the moon that can be resolved by a telescope whose objective lens has a diameter of 5 m with λ=6000Α is 

(a) 5.65 m                     (b) 28.25 m

(c) 11.30 m                    (d) 56.51 m

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Resolution of Optical devices
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The distance of the moon from earth is 3.8×105 km. The eye is most sensitive to light of wavelength 5500 Å. The minimum separation between two points on the moon that can be resolved by a 500 cm telescope will be 

(a) 51 m                         (b) 60 m

(c) 70 m                          (d) All the above

Concept Questions :-

Resolution of Optical devices
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