Question

if a laser beam of wavelength lamda= 200nm has angle of convergence =150. find out the radius of the beam at the beam waist​

Answer 1

Answer:

example

Explanation:

ANSWER

for a dark fringe to form

D

dy

=λ

y=

d

Dλ

=

10

−3

2×600×10

−9

=1.2mm

distance between the first dark fringes on either side of central bright fringe is 2×y=2.4mm

option D is correct