A He–Ne laser illuminates a narrow, single slit that is 1850 nm wide. The first dark...

Question

Question

A He–Ne laser illuminates a narrow, single slit that is 1850 nm wide. The first dark fringe is found at an angle of 20.0∘∘ from the central peak.

1) Determine the wavelength of the light from the laser. (Express your answer to three significant figures.)

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Answer 1

Answer #1

Solution dWe have d 1850 M 200 Condi tio for first dark tringe d sine - Then d sine (1830 nm) x sin(20) Wlave leng th 6 32.73

Answer 2

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