A colourless liquid forms a thin layer on a glass slab of refractive index

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

Problem

1.50

. The critical angle for the glass–liquid interface is

60^{\circ}

. Determine the critical angle (nearest whole degree) for the liquid–air interface. (a)

65^{\circ}

(b)

50^{\circ}

(c)

42^{\circ}

(d)

35^{\circ}