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Question
White light is incident normally on a glass plate (in air ) of thickness 500 nm and refractive index of 1.5. The wavelength (in nm ) in the visible region (400 nm − 700 nm ) that is strongly reflected by the plate is:
White light is incident normally on a glass plate (in air ) of thickness 500 nm and refractive index of 1.5. The wavelength (in nm ) in the visible region (400 nm − 700 nm ) that is strongly reflected by the plate is:
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Solution
The correct option is B 600
For maximum intensity,
Δx=2μt=(2n−1)λ2
⇒λ=4μt2n−1
=4×1.5×5002n−1
=30002n−1nm
substituting 1,2,3....... we get,
λ=3000nm,1000nm,600nm
So the required answer is 600 nm.
For maximum intensity,
Δx=2μt=(2n−1)λ2
⇒λ=4μt2n−1
=4×1.5×5002n−1
=30002n−1nm
substituting 1,2,3....... we get,
λ=3000nm,1000nm,600nm
So the required answer is 600 nm.
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