Optics Question 371

Question: Wavelength of light used in an optical instrument are $ {\lambda _{1}}=4000 $ Å and $ {\lambda _{2}}=5000 $ Å, then ratio of their respective resolving power (corresponding to $ {\lambda _{1}} $ and $ {\lambda _{2}}) $ is

[AIEEE 2002]

Options:

A) 16 : 25

B) 9 : 1

C) 4 : 5

D) 5 : 4

Show Answer

Answer:

Correct Answer: D

Solution:

R.P. $ \propto \frac{1}{\lambda }\Rightarrow \frac{{{(R.P.)} _{1}}}{{{(R.P.)} _{2}}}=\frac{{\lambda _{2}}}{{\lambda _{1}}}=\frac{5}{4} $



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