A coin at the bottom of a tank appears to be below the water surface

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

A coin at the bottom of a tank appears to be

12\,\text{cm}

below the water surface, while its actual depth is

15\,\text{cm}

. Estimate the critical angle for light travelling from this water to air. (a)

48^{\circ}

(b)

53^{\circ}

(c)

37^{\circ}

(d)

57^{\circ}