Question

if there are 15000 times in 3 cm on granting surface then granting element is
a.)2*10^-6m
b.)2*10^-4m
c.) 2*10^-7m
d.)2*10^-3m

Answer 1

option no.

D . is correct

2×10^-3

Referred the attachment below⬇️⬇️⬇️

Hope it helps u^_^

Answer 2

heya DEAR MATE

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For a plane diffraction grating the angular positions of principle maxima are given by

(a+b) sin (θn)=nλ,

WHERE

a+b is grating element=the distance between two consecutive slits.

n is order of principal maxima,where we get the spectral lines.

λ=Lambda= wavelength of light.

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