Optics Question 427

Question: A telescope of diameter 2m uses light of wavelength 5000 Å for viewing stars. The minimum angular separation between two stars whose image is just resolved by this telescope is

[MP PET 2003]

Options:

A) 4×10−4 rad

B) 0.25×10−6 rad

C) 0.31×10−6 rad

D) 5.0×10−3 rad

Show Answer

Answer:

Correct Answer: C

Solution:

Minimum angular separation Δθ=1R.P.=1.22 λd

=1.22×5000×10−102=0.3×10−6rad

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