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Q.

A telescope is used to resolve two stars separated by 4.6 × 10–6 rad. If the wavelength of light used is 5460Å, then the aperture of the objective of telescope should be

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a

0.145 m

b

0.567 m

c

1 m

d

2 m

answer is A.

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Detailed Solution

θ=1.22λD ∴D=1.22λθ=1.22×5460×10−104.6×10−6=0.145m
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