Physics, asked by asif990, 8 months ago


When monochromatic light of wavelength 5.0 x 10-7 m is incident normally on a plane
normal to the grating.
What is the number of lines per millimeter of the grating?
A) 250
BY 500
C) 1000
D) 4000​

Answers

Answered by misscutie94
0

Answer:

When monochromatic light of wavelength 5.0 x 10-7 m is incident normally on a plane

normal to the grating.

What is the number of lines per millimeter of the grating?

A) 250 BY 500

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Answered by hussainqamar42
1

Answer:

500 lines /mm

Explanation:

m = 2 (second order)

λ= 5×10^-7 m

L=1×10^-3 m (Length of grating of monochromatic Light)

sinθ = 30

No. of lines per mm ??

SOLUTION:

no. of lines = L / d

d = ??

m λ= d sinθ

d = mλ / sinθ

put the values and get answer 2×10^-6 m

No. of lines = L / d

No. of lines = 1×10^-3 / 2×10^-6

No. of lines = 0.5×10^3

No. of lines = 500 lines / mm

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