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
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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
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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