Question

parallel beam of light of wavelength 600nmis incident normally on diffraction grating. the grating has 500 lines per mm. how many beams of coherent light emerge from the grating with in shaded 90° region​

Answer 1

Answer:

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Explanation:

Distance of 2

nd

order maximum form the centre of the screen

x=

2

5

d

Dλ

Here, D=0.8m,x=15mm=15×10

−3

m

λ=600nm=600nm=600×10

−9

m

∴d=

2

5

⋅

x

Dλ

=

2

5

×

15×10

−3

0.8×600×10

−9

=80μm

solution