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It has a hole on it which allows a ray of light to enter.

Give the angle made with the normal of the hole when the ray of light enters such that the probability

that the ray comes out is the least?Assuming the ray can enter through any angle with the hole.

(eg.if the angle with the normal is 0 then probablity that the ray comes out is 1 as the ray reflects from the

surface and retraces itself resulting in the ray coming out in one reflection only)