Optics Question 1118
Question: Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å. What will be the fringe width on a screen placed 2m from the slits
[MP PET 2000]
Options:
A) 0.12 mm
B) 0.3 mm
C) 3.0 mm
D) 4.0 mm
Show Answer
Answer:
Correct Answer: B
Solution:
$ \beta =\frac{\lambda D}{d}=\frac{6000\times {{10}^{-10}}\times 2}{4\times {{10}^{-3}}}=3\times 10^{4}m=0.3\ mm $
