Red light of wavelength 625 nm is incident normally on a optical diffraction grating with `2xx10^(5)` lines/m. Including central principal maxima, how

Question

Red light of wavelength 625 nm is incident normally on a optical diffraction grating with `2xx10^(5)` lines/m. Including central principal maxima, how

Red light of wavelength 625 nm is incident normally on a optical diffraction grating with `2xx10^(5)` lines/m. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?
A. 15
B. 17
C. 8
D. 16

Monjur Alahi

6 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
For principal maxima in grating spectra
`(sin theta)/(N)= n lambda`
where, n=(1, 2, 3) is the order of principal maximum and `theta` is the angle of diffraction.
`n=(1)/(lambdaN)=(1)/(6.25xx10^(-7)xx2xx10^(5))=8`
`therefore` Number of maxima `=2n+1=2xx8+1=17`

6 views Answered 2023-02-05 15:29