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Question:

The ratio of resolving powers of an optical microscope for two wavelengths λ₁=4000Å and λ₂=6000Å is:

16:18

8:27

9:4

3:2

Solution:

Resolving power ∝ 1/λ
RP₁/RP₂ = λ₂/λ₁ = 6000/4000
RP₁/RP₂ = 3/2