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The following pattern was observed by a plane diffraction grating. How are the two images resolved?

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The following pattern was observed by a plane diffraction grating. How are the two images resolved?

(a) Not resolved

(b) Just Resolved

(c) Partially resolved

(d) Well resolved

I had been asked this question by my college director while I was bunking the class.

This intriguing question comes from Resolving Power of Grating topic in division Diffraction of Engineering Physics II

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Right answer is (b) Just Resolved

The explanation is: As stated in Rayleigh’s criteria, when the central maxima of one image coincide with the first minimum of the other image, the two images are said to be just resolved. In the fig, this condition is satisfied. Hence, the two lines are just resolved.

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