The ratio of resolving power of telescopes, when lights of wavelengths $4000 ˚ A$ and $5000 ˚ A$ are used, is ________

16 : 25

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4 : 5

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5 : 4

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9 : 1

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Solution

The correct option is C $5 : 4$
Resolving power of the telescope $(P) \propto \frac{1}{λ}$
$∴ \frac{P_{4000}}{P_{5000}} = \frac{5000}{4000} = \frac{5}{4} = 5 : 4$

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