question_answer

The first diffraction minimum due to the single slit diffraction is seen at \[\theta ={{30}^{o}}\]for a light of wavelength 5000 A falling perpendicularly on the slit. The width of the slit is [JEE ONLINE 12-05-2012]

A) \[2.5\times {{10}^{-5}}cm\]

B) \[1.25\times {{10}^{-5}}cm\]

C) \[10\times {{10}^{-5}}cm\]

D) \[5\times {{10}^{-5}}cm\]

Correct Answer: C

Solution :

[c] For first minimum,