Electromagnetic waves of wavelength $λ = 500 n m$ are incident on a standard YDSE apparatus. Both slits are of same width. Here slit separation $d = 3 m m$ , and screen distance $D = 2 m$ . Intensity at central maximum is $1 W / m^{2}$ , what is the intensity (in $W / m^{2}$ ) at a point 1 mm above maxima of order 1?

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answer is B.

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Detailed Solution

Fringe width,
$β = \frac{D λ}{d} = \frac{1}{3} m m$
At a point 1mm above maxima of order – 1
= 4th order maxima will be formed
Intensity at this point = 1W/m²

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