A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a scr

Question

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a scr

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is
A. 1.2 cm
B. 1.2 mm
C. 2.0 cm
D. 2.0 mm

Monjur Alahi

4 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 - D
Fringe width, `beta=(lambdaD)/(d)=(500xx10^(-9)xx2)/(1xx10^(-3))=10xx10^(-4)m`
So, distance between the first dark fringes on eitherside of the central bright fringe
`X=2beta=2xx10xx10^(-4)m`
`=20xx10^(-4)m=2.0mm`

4 views Answered 2023-02-05 15:29