Question

Light of wavelength 450 nm is incident on a diffraction grating on which 5000 lines/cm have been ruled. How many orders of spectra can be observed on either side of the direct beam?​

Answer 1

Answer:

4.4≈4

Explanation:

n=1/yN

first Convert 450 nm into cm =4.5×$10^{-5} cm$

now

n=1/4.5× $10^{-5} cm$ × 5000

n=100/22.5

n=4.44 ≈ 4

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Answer 2

The orders of spectra can be observed on either side of the direct beam in the 9.88.

Explanation:

$n=\frac{1}{n\alpha }$

$=\frac{1}{4.50*10^{-7}}*5000*10^{3}$

$=\frac{10^{2}}{4.50*5}$

$=\frac{100}{22.50}$

$=4.44$

$2n+L=2*4.44+1$

$=9.88$.