Optics Question 112
Question: Two point white dots are 1mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which dots can be resolved by the eye ?
[Take wavelength of light = 500 nm] [AIEEE 2005]
Options:
A) 6 m
B) 3 m
C) 5 m
D) 1 m
Show Answer
Answer:
Correct Answer: C
Solution:
$ \frac{1.22\lambda }{a}=\frac{x}{d}\Rightarrow d=\frac{x\times a}{1.22\lambda } $
$ =\frac{1\times {{10}^{-3}}\times 3\times {{10}^{-3}}}{1.22\times 500\times {{10}^{-9}}} $ = 5m
