Water lies over a glass block with plane

PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

Water

(n=1.33)

lies over a glass block

(n=1.52)

with plane, parallel surfaces. A ray in water is incident on the water–glass boundary at an angle

i

to the normal. Determine the minimum value of

i

for which the ray undergoes total internal reflection at the glass–air interface on the far side of the block.