Question 68 of 295

A green light is incident from the water to the air - water interface at the critical angle $\left({\theta }_{c}\right)$. Select the correct statement.

AThe entire spectrum of visible light will come out of the water at an angle of 90o to the normalBThe spectrum of visible light whose frequency is less than that of green light will come out to the air mediumCThe spectrum of visible light whose frequency is more than that of green light will come out to the air mediumDThe entire spectrum of visible light will come out of the water at various angles to the normal

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Answer: (B) The spectrum of visible light whose frequency is less than that of green light will come out to the air medium

$\text{sin} {\theta }_{\text{c}}=\dfrac{1}{\mu }$


For greater wavelength (i.e lesser frequency) μ is less So, ${\theta }_{\text{c}}$ would be more. So, they will not suffer reflection and come out at angles less than ${\text{90}}^{^{\circ}}$.

JEE Main Physics practice question on Ray Optics (Critical angle and total internal reflection), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.