Wavelength of light used in an optical i...

Wavelength of light used in an optical instrument are `lambda_(1) = 4000 Å` and `lambda_(2) = 5000Å` then ratio of their respective resolving powers (corresponding to `lambda_(1)` and `lambda_(2)`) is

`16 : 25`

`9:1`

`4:5`

`5:4`

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