Optics Question 216
Question: What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength $ 6000{AA} $ is used and slit width is $ 12\times {{10}^{-5}}cm. $
[RPMT 2004]
Options:
A) 2 rad
B) 3 rad
C) 1 rad
D) 8 rad
Show Answer
Answer:
Correct Answer: C
Solution:
Angular width $ =\frac{2\lambda }{d}=\frac{2\times 6000\times {{10}^{-10}}}{12\times {{10}^{-5}}\times {{10}^{-2}}}=1rad\text{.} $
