A parallel beam of monochromatic light of $$wave-length$$ $$450$$ nm passes through a slit of width $$0.2$$ mm. Find the angular divergence in which most of the light is diffracted

Question

Infinity Learn · Accepted Answer

Most of the light is diffracted between the two first order minima. These mimima occur at angle given by dsinθ$$=$$±nλFor $$n=1$$,   $$sin$$θ$$=$$±λ$$d=$$±$$450$$×$$10$$−$$90.2$$×$$10$$−$$3=$$±$$2.25$$×$$10$$−$$3$$ rad∴The angular $$divergence=2$$×θ $$=$$ $$2$$×$$2.25$$×$$10$$−$$3rad$$                                                                                             $$=$$ $$4.5$$×$$10$$−$$3rad$$

A parallel beam of monochromatic light of wave-length 450 nm passes through a slit of width 0.2 mm. Find the angular divergence in which most of the light is diffracted

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