A telescope has an objective of diameter 2.5m. What is its angular resolution when observed at 7500Å ?

Q.14 A telescope has an objective of diameter 2.5m. What is its angular resolution when observed at 7500Å ?

Doubtly Asked 29 Oct 2026 Board exam · July 2024 hsc 12th Save WhatsApp Report

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Answer: \(\theta = 3.66\times10^{-7}\) rad

Limit of resolution of a telescope:

\[\theta = \frac{1.22\lambda}{D} = \frac{1.22\times7500\times10^{-10}}{2.5} = \frac{9.15\times10^{-7}}{2.5} = 3.66\times10^{-7}\ \mathrm{rad}\]

Doubtly AI · 29 Oct 2026 AI-generated · not yet verified Report

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