Physics, asked by shantamDey8444, 11 hours ago

M1 and m2 are two plane mirrors which are kept parallel to each other a shown. There is a point o on perpendicular screen just in front of s

Answers

Answered by KavyDixit
0

Answer:

Light emerging from point S gets reflected from mirrors M

1

and M

2

, to interfere constructively at point O.

This means that path difference between light travelling SM

1

O and SM

2

O must be λ.

As shown in the figure, path SM

1

O=2

(

2

D

)

2

+(

2

d

)

2

path SM

2

O=2

(

2

D

)

2

+d

2

2

(

2

D

)

2

+d

2

− 2

(

2

D

)

2

+(

2

d

)

2

Thus using Bionomial expansion, λ comes out to be

2D

3d

2

.

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