14 Light of wavelength 5000x10-10m is incident normally on a slit The first minimum incident of the diffraction pattern is - Physics - Wave Optics

Question

14 Light of wavelength 5000x10-10m is incident normally on a slit
The first minimum incident of the diffraction pattern is observed
to lie at a distance of 5mm from the central maximum on a screen
placed at a distance of 3mfrom the slit Then the width of the slit
is -----------

Adnan Kagzi · Accepted Answer

use formula y=XD/d
X= wavelength
Y= distance of first minima
D= distance between slit and screen
d= what is required

d = XDy = 5000×10-10×35×10-3 = 3×10-4 = 0
3 mm

14.Light of wavelength 5000x10-10m is incident normally on a slit.The first minimum incident of the diffraction pattern is observed to lie at a distance of 5mm from the central maximum on a screen placed at a distance of 3mfrom the slit.Then the width of the slit is -----------