A convex lens is held above the bottom of an empty tank

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

A convex lens is held

45\ \text{cm}

above the bottom of an empty tank. The image of a point at the bottom of the tank is formed

36\ \text{cm}

above the lens. Now, a liquid is poured into the tank to a depth of

40\ \text{cm}

. It is found that the image of the same point at the bottom of the tank is

48\ \text{cm}

above the lens. Find the refractive index of the liquid.