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White light is incident normally on a gl...

White light is incident normally on a glass plate (in air) of thickness 500nm 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

A

`450`

B

`600`

C

`400`

D

`500`

Text Solution

Verified by Experts

The correct Answer is:
B
For strong reflection.
`2mut=(lambda)/(2),(3lambda)/(2),(5lambda)/(2).....rArr lambda=4mut,(4mut)/(3),(4mut)/(5),(4mut)/(7).....`
`rArr 3000 nm. 1000 nm, 600 nm, 333 nm.`
`rArr` only option is `600 nm`.
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