Question

if the angle of incidence and angle of emergence of a light ray falling on a glass slab are i and e respectively,prove that i=e with the help of the diagram.​

Answer 1

Explanation:

• In the figure above, refraction of light takes place twice in the glass slab.
• The first refraction takes place at point N on side PQ when ray of light enters from air medium to glass medium
• The second refraction takes place at point Mon the side SR when the ray of light enters from glass medium to air medium
• In the above figure,

i=angle of incidence

r=angle of refraction

e=angle of emergence

• At the point N, using snell's law

n = sini

air glass. sir r

• At point M, using snell's law

n = sin r

glass air sin e

• But, n = 1.

air glass n

glass. air

• sin i. = 1.

sin r sin r

sin e

• sin i =sin e

i. e:angle i = angel e

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Answer 2

Answer:

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