A telescope having a objective is used to view two stars

PHYSICS · Single correct · A Level · Physics · Astrophysics · Astrophysics

Problem

A telescope having a 0.20 m0.20\,\text{m} objective is used to view two stars. Which colour of light will give the greatest resolving power for the same telescope? (a) Green light (λ≈550 nm)(\lambda \approx 550\,\text{nm}) (b) Red light (λ≈700 nm)(\lambda \approx 700\,\text{nm}) (c) Blue light (λ≈450 nm)(\lambda \approx 450\,\text{nm}) (d) Resolving power is the same for all colours

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