Suppose the light shown is totally internal reflected and the angle shown $\theta_1$ is the critical angle.

Does the light still totally internally reflect if we maintain the direction of the incident ray but rotate the prism (a) 10° clockwise and (b) 10° counterclockwise ?

Question

Suppose the light shown is totally internal reflected and the angle shown $\theta_1$ is the critical angle.

Does the light still totally internally reflect if we maintain the direction of the incident ray but rotate the prism (a) 10° clockwise and (b) 10° counterclockwise ?

ganeshie8 · Answer

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ganeshie8 · Answer

I remember snells law $n_1\sin\theta_1 = n_2\sin\theta_2$, but this problem appears to be a qualitative type... Is it possible to answer this w/o doing too many calculations ?

parthkohli · Answer

so glass is denser than air. let's see if any deviation of the light ray causes the angle to increase or decrease.|dw:1456642587454:dw|