Question

# Light is incident on a glass block as shown in Fig. If θ1 is increased slightly, what happens to θ2?

A
θ2 also increases slightly
B
θ2 is unchanged
C
θ2 decreases slightly
D
θ2 changes abruptly, since the ray experience total internal reflection
Solution
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#### if θ1 and θ2 are angle of incidence and angle of refraction respectively for a interface then according to snell's law ,μ1sinθ1=μ2sinθ2i.e, sinθ1∝sinθ2θ1∝θ2as the θ1 increases the refracting angle at 1st interface increases this results in decrease of incident angle on 2nd interface which in turn decreases the refreacting angle at 2nd interface i.e, θ2 decreases

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