A transparent solid has a critical angle of when in contact with air

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

Problem

A transparent solid has a critical angle of

40^{\circ}

when in contact with air. What will be its critical angle when the same solid is in contact with water

(n_{\text{water}}=1.33)

? (a)

32^{\circ}

(b)

58.6^{\circ}

(c)

40^{\circ}

(d)

66^{\circ}