1.

In a single slit diffraction of light of wavelength l by a slit of width e, the size of the central maximum on a screen at a distance b is

A.            \[2b\lambda +e\]              
B.            \[\frac{2b\lambda }{e}\]
C.            \[\frac{2b\lambda }{e}+e\]   
D.            \[\frac{2b\lambda }{e}-e\]
Answer» D.            \[\frac{2b\lambda }{e}-e\]


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