Question

The following questions are related to chapter - Refraction of light at plane surfaces Class - 10

Answer 1

Explanation:

1)Critical angle

Hint: The angle of incidence in the denser medium for which the angle of refraction in the rarer medium is 900 is called the critical angle.

2) D

3)Total internal reflection.

Hint: When the angle of incidence is greater than the critical angle, the phenomenon of total internal reflection occurs due to which the ray of light is not refracted but is reflected back in the same medium.

4)For the ray PR, the angle of incidence is less than the critical angle (i.e. <PQS); hence, at the interface of two media as per the laws of reflection, ray PR suffers partial reflection and refraction.

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