Question

68. A bird is flying vertically downwards the surface of water of a lake with constant speed. For

a fish inside the water exactly below the bird, the bird appears to be
​

Answer 1

Answer:

μ be the relative refractive index of the 2 materials,

then

Apparent Height

Real Height

=

μ

1

Thus, the apparent height of the bird will be more when viewed by the fish.

For refraction at plane surface

v

μ

2

=

ω

μ

1

Let x be the height of bird above water For light travelling from bird to fish

μ

1

=1;μ

2

=μ

ω=−x

v

μ

=−

x

1

v=−μx

∣v∣=μx>x

Speed of bird=x

Apparent speed of bird=∣v∣

=μx

Explanation:

hope it's help u

Answer 2

Answer:

12 centimeter in 2second.

Explanation:

it may help you

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