CUET · PHYSICS · PYQ PAPER 2023
Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600 nm, coming from a distant object, the limit of resolution of the telescope is close to :
- A \( 1.5 \times 10^{-7} \text{ rad} \)
- B \( 2 \times 10^{-7} \text{ rad} \)
- C \( 3 \times 10^{-7} \text{ rad} \)
- D \( 4.5 \times 10^{-7} \text{ rad} \)
Answer & Solution
Correct Answer
(C) \( 3 \times 10^{-7} \text{ rad} \)
Step-by-step Solution
Detailed explanation
\( \theta = \frac{1.22 \lambda}{D} = \frac{1.22 \times 600 \times 10^{-9} \text{ m}}{250 \times 10^{-2} \text{ m}} \approx 3 \times 10^{-7} \text{ rad} \)
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