1.

light of wavelength 700 NM is incident on pair of slits forming fringes three apart on a screen what is difference basing when light of wavelength 350 NM is used and The Separation is doubled​

Answer»

Answer:

Position of NTH bright fringe y

n

=

d

nλD

GIVEN : λ=700 nm

∴ y

3

=

d

3×700D

⟹y

3

=

d

2100D

The 5th bright fringe DUE to LIGHT of wavelength λ

is formed at y

3

∴ y

5

=y

3

OR

d

5×λ

D

=

d

2100D

⟹ λ

=

5

2100

=420 nm

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