What is the diameter of a telescope's objective lens? - Quora
Objective Lens Diameter: Factors to Decide How Large | Airgun Forum | Airgun Nation | Best Airgun Site | Airgun Message Board
The optical telescope in the Vainu Bappu observatory at Kavalur has an objective lens of diameter 2.3.m. What is its angular resolution if the wavelenght of light used is 589 nm?
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