Question

Light of wavelength $5000 \times 10^{-10}m$ is incident normally on a slit The first minimum of the diffraction pattern is observed to lit at a distance of 5mm from the central maximum on a screen placed at a distance of 3m from the slit. Then the width of the slit is.

• A. 3 cm
• B. 0.3 cm
• C. 0.03 cm
• D. 0.01 cm

Answer 1

Answer: (C)

0.03 cm

Answer 2

$a$ sin $\theta = n \lambda ; a \frac{Y}{D} = n \lambda$ $a = \frac{n \lambda D}{Y}$