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A parallel beam of monochromatic light of wavelength 450 m passes through a long slit of width 0.2 mm. find the angular divergence in which most of the light is diffracted.

Text Solution

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Most of the light is diffracted between the two first order minima
Which occurs between `theta=pm(lambda)/b`
Here `lambda=450nm`
b=0.2 mm
`rArr theta ~=pm2.25xx10^(-3)` radian
Hence angular divergence =`2theta=4.5xx10^(-3)` radian
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