Question

The fringe width in young's experiment is found to be 1 mm when wave length light is 4000 Å what will be the fringe width if wave length of light changes 6000 Å​

Answer 1

In Young's experiment ,light of wavelength 4000A

0

is used to produce bright fringes of width 0.6mm , at a dipped in a liquid of refractive index 1.5 , then the fringe width will be

Fringe width,βαλ

∴

β

2

β

1

=

λ

2

λ

1

or

β

2

β

1

=

λ

1

/μ

λ

1

∴β

2

=

β

2

β

1

=

1.5

0.6

=0.4mm

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