TS EAMCET · Physics · Ray Optics
The limit of resolution of a telescope is \(3.0 \times 10^{-7} \mathrm{rad}\). Assuming that it is used to see the light of wavelength \(525 \mathrm{~nm}\) from a star, what should be the diameter of the objective?
- A \(2.1 \mathrm{~m}\)
- B \(2.0 \mathrm{~m}\)
- C \(1.8 \mathrm{~m}\)
- D \(1.9 \mathrm{~m}\)
Answer & Solution
Correct Answer
(A) \(2.1 \mathrm{~m}\)
Step-by-step Solution
Detailed explanation
Limit of resolution or angular resolution for a telescope is \(\alpha_{\min }=\frac{1.22 \lambda}{D}\) Here,\(\alpha_{\min }=3 \times 10^{-7} \mathrm{rad}\), \(\lambda=525 \mathrm{~nm}=525 \times 10^{-9} \mathrm{~m}\) \(\therefore\) Diameter of objective lens is…
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