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When the light of wavelength of 4000Å is...

When the light of wavelength of `4000Å` is made incident on a disc then it covers `2HPZ`.if the light of wavelength `8000Å`is made incident on it then the number of `HPZ`covered it will be -

A

`1`

B

`2`

C

`3`

D

`4`

Text Solution

Verified by Experts

The correct Answer is:
1
`n_(1)lambda_(1)=n_(2)lambda_(2)`
`n_(2)=(n_(1)lambda_(1))/(lambda_(2))`
`rArr n_(2)=(4000xx2)/(8000)=1`
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