A fish is a little below the surface of a lak | vedclass

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(C) When a fish looks up from below the water surface,it can see the entire outside world through a cone of light. This phenomenon occurs due to the r

Vedclass · Accepted Answer

$	heta = 98^\circ$

Vedclass · Answer

(C) When a fish looks up from below the water surface,it can see the entire outside world through a cone of light. This phenomenon occurs due to the refraction of light rays coming from the air into the water. The light rays that reach the fish's eye from the surface are limited by the critical angle $c$. Any light ray incident at an angle greater than the critical angle $c$ undergoes total internal reflection and does not reach the fish from the outside. From the geometry of the cone of light,the total angular range $	heta$ subtended by the cone at the fish's eye is twice the critical angle. Therefore,$	heta = 2c$. Given that the critical angle $c = 49^\circ$,we have $	heta = 2 	imes 49^\circ = 98^\circ$.

$A$ fish is a little below the surface of a lake. If the critical angle is $49^\circ$,then the fish could see things above the water surface within an angular range of $\theta^\circ$ where

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