Question

will its moment of inertia be, when rotated about its own axis
ii) A plane wavefront of light of wavelength 5500 AU is incident on two slits on the screen
perpendicular to the direction of light rays. If the total separation of 10 bright fringes on a screen
2 m away is 2 cm. Find the distance between the slits.​

Answer 1

Answer:

Location of bright fringes is given by 

xn=nλD/b

where

n: nth bright fringe, λ: wavelength, D: distance between slits and screen, b: slit width

Fringe width(β) is equal to the separation between two consecutive bright(or dark) fringes.

β=λD/b..(i)

Angular fringe width θ is the angle subtended by a fringe width at the slits.

∴θ=β/D...(ii)

From (i) and (ii),

θ=λ/b