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No. of waves of a certain colour light a...

No. of waves of a certain colour light are 2000 in 1 mm distance in air, then what will be wavelength of light in medium of refractive Index 1.25 ?

A

1000 Å

B

2000 Å

C

3000 Å

D

4000 Å

Text Solution

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The correct Answer is:
D
`lambda_("air")=(1mm)/(2000)=5xx10^(-4)mm=5000 Å`
`:.lambda_("medium")=(lambda_("air"))/(mu)=(5000Å)/(1.25)=4000Å`
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