Question

In YDSE experiment if slit separation is 0.4 mm and wavelength of light used is 400 nm, then number of maxima observed [for $\theta ={37}^{\circ }$] between C and P are

• A. 598
• B. 749
• C. 224
• D. 500

Answer 1

The correct option is A 598


Path difference $\Delta x=dsin\theta \dots \dots \dots \left(1\right)$

$\Delta x=n\lambda$

By (1) and (2)

$n\lambda =\frac{3d}{5}\Rightarrow n=\frac{3d}{5\lambda }=600$

Excluding at P and C, number of maxima = 598