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Q.

The Fraunhofer diffraction pattern of a single slit is formed in the focal plane of a lens of focal length 1 m. The width of the slit is 0.3 mm. If the third minimum is formed at a distance of 5 mm from the central maximum then the wavelength of light will be ---

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a

8500 A°

b

5000 A°

c

2500 A°

d

7500 A°

answer is C.

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Detailed Solution

asin⁡θ=nλ;ayf=nλ;λ=0.3×10−3×5×10−3(3)(1)=5×10−7m=5000A0

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