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CSE · Paper I · Waves & Opticscse-1996-subject-02-006

Diffraction (Question 1 (20 Marks)) — UPSC Physics Optional CSE 1996 Paper I

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The angular separation between two distant stars is 1 arc-second. If the effective wavelength of light is 5500 Å; what should be the diameter of the objective of a telescope so that the stars are just resolved?

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