When light traveling inside a glass slab of index approaches a plane boundary with air

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

Problem

When light traveling inside a glass slab of index

1.50

approaches a plane boundary with air, what is the critical angle for the glass–air interface, measured from the normal inside the glass? (a)

30^{\circ}

(b)

42^{\circ}

(c)

60^{\circ}

(d)

48^{\circ}