What is the longest $\lambda $ that can be observed in the $4^{th}$ order for a grating having 6000 lines/cm?

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What is the longest $\lambda $ that can be observed in the $4^{th}$ order for a grating having 6000 lines/cm?

written 6.3 years ago by

neeta.vanage • 860

modified 2.3 years ago by

pedsangini276 • 4.7k

Subject: Applied Physics 2

Topic: Interference And Diffraction

Difficulty: Medium

engineering physics

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1 Answer

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written 6.2 years ago by

neeta.vanage • 860

Grating equation is (a+b) sinθ =nλ, N= 6000 lines/cm

For longest wavelength sinθ= 1

Therefore $λ = \frac{(a+b)}{n}= \frac{1}{Nn} = 4166 AU$

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