wiz-icon
MyQuestionIcon
MyQuestionIcon
8
You visited us 8 times! Enjoying our articles? Unlock Full Access!
Question

A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5×105 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is

A
0.12 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
0.15 cm
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
0.25 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
0.20 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B 0.15 cm
As given,
f=D=60 cm

For first minima,
y=λDa=5×105×602×102=0.15 cm$

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Other Cases of Diffraction
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon