A ray of light is incident at an angle of incidence, i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face.If the refractive index of the prism is μ, the angle of incidence i, is nearly equal to

(a)μA                                    (b)μA2

(c)A/μ                                  (d)A/2μ

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A concave mirror of focal length f1 is placed at a distance of d from a convex lens of focal length f2. A beam of light coming from infinity and falling on this convex lens concave mirror combination returns to infinity. The distance d must be equal

(a)f1+f2                                 (b)-f1+f2

(c)2f1+f2                                (d)-2f1+f2

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The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20cm. The focal length of lenses are 

(a) 10cm,10cm

(b) 15cm,5cm

(c) 18cm,2cm

(d) 11cm,9cm

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For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index

 

(a) lies between 2 and 1

(b) lies between 2 and 2

(c) is less than 1

(d) is greater than 2

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A rod of length 10 cm lies along the principal

axis of a concave mirror of focal length 10 cm

in such a way that its end closer to the pole is 

20 cm away from the mirror. The length of the 

image is

(a) 10 cm

(b) 15 cm

(c)2.5 cm

(d) 5 cm

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Reflection at spherical surface
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A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describes best the image formed of an object of height 2 cm placed 30 cm from the lens?

(a) Virtual, upright, height=0.5 cm

(b) Real, inverted, height=4 cm

(c) Real, inverted, height=1 cm

(d) Virtual, upright, height=1 cm

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Which of the following is not due to total internal reflection?

(a) Difference between apparent and real depth of a pond

(b) Mirage on hot summer days

(c) Brilliance of diamond

(d) Working of optical fibre

Concept Questions :-

Total internal reflection
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A thin prism of angle 15° made of glass of refractive index μ1=1.5 is combined with another prism of glass of refractive index μ2=1.75. The combination of the prism produces dispersion without deviation. The angle of the second prism should be 

(a) 7°                                              (b) 10°

(c) 12°                                             (d) 5°

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A converging beam of rays is incident on a diverging lens. Having passed though the lens the rays intersect at a point 15cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5cm closer to the lens. The focal length of the lens is:

(a) -10cm                                   (b) 20cm

(c) -30cm                                   (d) 5cm

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A ray of light traveling in a transparent medium of refractive index μ falls, on a surface separating the medium from the air at an angle of incidence of 45°.For which of the following value of μ the ray can undergo total internal reflection?

(a) μ=1.33                             (b) μ=1.40

(c) μ=1.50                             (d) μ=1.25

Concept Questions :-

Total internal reflection
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