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  4. The least resolvable:angle by a telescope using objective of aperture 5 m is nearly (λ = 4000A°)

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Q. The least resolvable:angle by a telescope using objective of aperture 5 m is nearly $(\lambda = 4000A^\circ)$

Wave Optics

Solution:

$\theta = \frac{1.22 \lambda}{a}$