JEE MAIN - Physics (2014 (Offline) - No. 8)
A green light is incident from the water to the air - water interface at the critical angle $$\left( \theta \right)$$. Select the correct statement.
The entire spectrum of visible light will come out of the water at an angle of $${90^ \circ }$$ to the normal.
The spectrum of visible light whose frequency is less than that of green light will come out to the air medium.
The spectrum of visible light whose frequency is more than that of green light will come out to the air medium.
The entire spectrum of visible light will come out of the water at various angles to the normal.
Explanation
For critical angle $${\theta _c},$$
$$\sin {\theta _c} = {1 \over \mu }$$
For greater wavelength or lesser frequency $$\mu $$ is less.
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So, critical angle would be more, So, they will not suffer reflection and come out at angles less then $${90^ \circ }.$$
$$\sin {\theta _c} = {1 \over \mu }$$
For greater wavelength or lesser frequency $$\mu $$ is less.
So, critical angle would be more, So, they will not suffer reflection and come out at angles less then $${90^ \circ }.$$
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