Consider the diffraction pattern due to a single site. The first maximum for a certain monochromatic light coincides with the first minimum for red light of wavelength 660nm. The wavelength of the monochromatic light is

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Consider the diffraction pattern due to a single site. The first maximum for a certain monochromatic light coincides with the first minimum for red light of wavelength 660nm. The wavelength of the monochromatic light is

Patel yash 20th Nov, 2019

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Answer (1)

VIKASH MISHRA 11th Dec, 2019

Solution :

For first minima of red

sinθ=λrdsinθ=λrd

For first maximum of other wave length

sinθ1=3λ′2dsinθ1=3λ′2d

But sinθ=sinθ1sinθ=sinθ1

=> 3λ12d=λd3λ12d=λd

λ1=23λ1=23 λrλr

=23=23 ×660×660

=440nm

~peace

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