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Wavelength of light used in an optical i...

Wavelength of light used in an optical instrument are `lambda_1= 4000 Å` and `lambda_2 =5000 Å`, then ratio of their respective resolving powers (corresponding to `lambda_1 ` and `lambda_2`) is

A

`16 : 25`

B

`9:1`

C

`4:5`

D

`5:4`

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The correct Answer is:
D
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