A bird flies down vertically towards a water surface. To a …

Physics Ray Optics Mix MCQ (Single Correct)

A bird flies down vertically towards a water surface. To a fish inside the water, vertically below the bird, the bird will appear to –

Be farther away than its actual distance

Be closer than its actual distance

Move faster than its actual speed

Move slower than its actual speed

Text Solution

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The correct answer is:

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Ans. 460. (a, c)

For refraction at plane surface, =

Let x = height of the bird above the water surface

For light travelling from the bird to fish,

µ 1 = 1, µ 2 = µ (refractive index of water) and u = –x,

hence, = or v = – µx

or, | v | = µx, i.e., | v | > x

Speed of the bird = x

∴ Apparent speed of the bird = | v | = µx

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