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Question 1

A fish rising vertically up towards the surface of water with speed 3 ms^–1 observes a bird diving vertically down towards it with speed 9 ms^–1. The actual velocity of bird is (Refractive index of water is 4/3)

Question 2

In a fibre optical wire refractive index of the core of the wire is

and refractive index of cladding is

. Find the value of refractive index

so the critical angle at the will be

. Assume that

Question 3

The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let D₁ and D₂ be angles of minimum deviation for red and blue light respectively in a prism of this glass. Then,

Question 4

A parallel beam of monochromatic light is incident on one face of an equilateral prism, the angle of incidence being 55 °. The angle of emergence of the beam from the other face is 46 ° .The angle of minimum deviation is -

Question 5

The graph between angle of deviation (δ) and angle of incidence (i) for a triangular prism is represented by:

Question 6

If the image formed by a thin convex lens of power P has magnification m then image distance

Question 7

A wire mesh consisting of very small squares is viewed at a distance of 8 cm through a magnifying converging lens of focal length 10 cm, kept close to the eye. The magnification produced by the lens is

Question 8

Calculate the focal length of a reading glass of a person if his distance of distinct vision is 75 cm.

Question 9

Which of the following is used in optical fibres?

Question 10

When light is refracted from a surface, which of its following physical parameters does not change?

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Jun 16JEE & BITSAT