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De Broglie's Hypothesis

In Fraunhofer...

Question

In Fraunhofer diffraction, what kind of source of light is used and where is it situated?

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Solution

In Fraunhofer diffraction, we use Laser source. It is situated behind the slit, more clearly we can see it in diagram.

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Q. In Fraunhofer diffraction experiment,

L

is the distance between screen and the obstacle,

b

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A

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, using light of wavelength

500 n m

?

Q. A single slit Fraunhofer diffraction pattern is formed with white light. For what wavelength of light, the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for red light of wavelength

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and screen is at

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5000 \circ A

then the distance between the first minimum on either side of the central maximum is

(θ

is small and measure in radian):

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