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Question

Wavelength of light used in an optical instrument are λ1=4000˚A and λ2=5000˚A then ratio of their respective resolving powers(corresponding to λ1 and λ2) is

A
16:25
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B
9:1
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C
4:5
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D
5:4
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Solution

The correct option is D 5:4
We know,
Resolving Power 1λ

Given,
λ1=4000˚A
λ2=5000˚A

RPλ1RPλ2=λ2λ1

RPλ1RPλ2=50004000=54

RPλ1:RPλ2=5:4
Hence, the correct answer is OPTION D.

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