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A plane grating just resolve two lines in the second order.

Calculate the grating element if dλ=6A0,λ=6×105 and width of ruled surface is 2cm.


Mumbai university > FE > SEM 2 > Applied Physics II

Marks: 5M

Year: Dec 2013

1 Answer
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Given:

width of ruled surface, L= 2 cm

dλ=6A0=6×108

λ=6×108cm

m=2

To find:

Grating Element (d = a + b)

Solution:

We know,

R.P=λdλ=mN

6×1056×108=(2)N

N=500

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