IIT-JEE 2007 · Paper 1 · Physics Q7

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PhysicsSingle correct+3 / -1Question 7 of 66

A ray of light traveling in water is incident on its surface open to air. The angle of incidence is $\theta$ , which is less than the critical angle. Then there will be

only a reflected ray and no refracted ray

only a refracted ray and no reflected ray

a reflected ray and a refracted ray and the angle between them would be less than

180°-2\theta

a reflected ray and a refracted ray and the angle between them would be greater than

180°-2\theta

Answer and worked solution

Official answer: C

Below the critical angle there is partial reflection and refraction, so both rays exist.

Angle between them. The reflected ray makes θ with the normal, the refracted ray $r$ with the normal on the other side, and going from water to air $r>\theta$ . The angle between the rays is
$180°-\theta-r<180°-2\theta.$

(C)

Topics:Refraction at plane surfaces Reflection and plane mirrors

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IIT-JEE 2007 · Paper 1, Physics question 7