Physics Past Questions and Answers

Which of the following condition is necessary for the occurrence of total internal reflection of light?

The image which cannot be formed on a screen is said to be

An object is placed on the principal axis and at the centre of curvature of a concave mirror, the image of the image formed by the mirror is

A converging lens produces an image four times as large as an object placed 25cm from the lens. Calculate its focal length

The horizontal floor of a water reservoir appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.35, calculate the real depth of the reservoir