A white light is used to study single-slit diffraction pattern. For what $\lambda$ of light does the $2^{nd}$ minimum coincide with the $3^{rd}$ minimum for 4000 $\mathring{A}$ line?

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A white light is used to study single-slit diffraction pattern. For what

$\lambda$ of light does the

$2^{nd}$ minimum coincide with the

$3^{rd}$ minimum for 4000

$\mathring{A}$ line?

written 7.2 years ago by

neeta.vanage • 880

modified 3.2 years ago by

pedsangini276 • 4.8k

Subject: Applied Physics 2

Topic: Interference And Diffraction

Difficulty: Medium

engineering physics

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1 Answer

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written 7.1 years ago by

neeta.vanage • 880

modified 7.1 years ago by

mananbothra • 100

Condition for minima in single slit: a sinθ = nλ

For second minimum: a sinθ = 2 λ $_1$

For third minimum: a sinθ = 3 λ $_2$

λ $_2$ = 4000 AU

2 λ $_1$ = 3 λ $_2$

λ $_1$ = 6000AU

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