Question

0,6 Two narrow slits are separate by 1mm from each other and lying at im
distance from a screen. Calculate fringe width if greenish blue light of
(4)
wavelength 500 nm is used.​

Answer 1

Answer:

d=10

−3

m

D=1m

λ=500×10

−9

m

The width of central maxima in a single slit diffraction:

a

2λD

Fringe width in double slit pattern: β=

d

λD

Given,

10β=

a

2λD

⇒10

d

λD

=

a

2λD

⇒a=

5

d

mm=0.2mm

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