Question

A fish is a little away below the surface of a lake. If the critical angle is 49°, then the fish could see things above the water surface within an angular ring of θ° where θ is

Answer 1

Answer:

Given: A fish is a little way below the surface of a lake. If the critical angle is 49

o

, then the fish could see things above the water surface within an angular ring at θ

o

To find the value of θ

Solution:

From the given figure it is clear that,

angular range is twice the critical angle.

Critical angle, θ

c

=49

∘

Therefore, θ=2×θ

c

⟹θ=2×49

∘

⟹θ=98

∘