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{.} $



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