Two slits are made one millimetre apart with screen placed one metre away and blue-green light of wavelength $500$ nm is used. What should width of each slit be to obtain $10$ maxima of double slit pat-tern within central maximum of single slit pattern?

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Solution

The correct option is C $0.2$ mm
Given,

$\frac{2 λ D}{b} = \frac{10 λ D}{d}$

$\Rightarrow b = \frac{d}{5}$

$= \frac{1}{5} = 0.2 m m$

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