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
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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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