Optics Question 436

Question: The diameter of objective of a telescope is 1m. Its resolving limit for the light of wave length 4538 Å, will be

[Pb. PET 2003]

Options:

A) $ 5.54\times {{10}^{-7}}rad $

B) $ 2.54\times {{10}^{-4}}rad $

C) $ 6.54\times {{10}^{-7}}rad $

D) None of these

Show Answer

Answer:

Correct Answer: A

Solution:

Resolving limit $ d\theta =\frac{1.22\lambda }{a}=\frac{1.22\times 4538\times {{10}^{-10}}}{1} $

$ =5.54\times {{10}^{-7}}rad $ .



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