Optics Question 200
Question: What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm
[Pb. PMT 2001]
Options:
A) 0.001 rad
B) 0.01 rad
C) 1 rad
D) 0.1 rad
Show Answer
Answer:
Correct Answer: A
Solution:
Using $ d\sin \theta =n\lambda , $ for n =1 $ \sin \theta =\frac{\lambda }{d}=\frac{550\times {{10}^{-9}}}{0.55\times {{10}^{-3}}}={{10}^{-3}}=0.001\ rad $
