Question

(3)
A ray of light makes an angle of 50° with the surface S, of
the glass slab. Its angle of incidence will be
(a) 50°
(b) 40°
(c) 140°
(d) 0°

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Answer 1

A ray of light makes an angle of 50° with the surface S, of

the glass slab. Its angle of incidence will be

(a) 50° ✔✔

(b) 40°

(c) 140°

(d) 0°

Answer 2

Answer:b

Step-by-step explanation:

Acc. To me

When a light incident or refract he angle measured from normal and normal is always drawn perpendicular to surface.

So if light makes 50 with surface. I pervious tell angle measured from normal that is perpendicular it means normal make 90 with surface. If you minus the surface angle with whole then you find answer.

Normal and surface =90

Angle with surface =50

Angle with normal 90-50=40.

I hope it help