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Light enters an isosceles right triangular prism at normal incidence through face AB and undergoes total internal reflection at face BC as shown below

The minimum value of the refractive index of the prism is close to

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KVPY Other Question

A girl standing at point P on a beach wishes to reach a point Q in the sea as quickly as possible. She can run at 6 km h1 on the beach and swim at 4 km h1 in the sea. She should take the path A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque, then
option
(A) only half of the image will be visible
(B) the image position shifts towards the lens
(C) the image position shifts away from the lens
(D) the brightness of the image reduces