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InterviewSolution
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A telescope has an objective lens of `10cm` diameter and is situated at a distance of one kilometre from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is `5000 Å`, of the order ofA. 5 mmB. 5 cmC. 2.5 mD. 5 m |
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Answer» Correct Answer - A Here, `D = 10 cm, x = 1 km = 10^5 cm` Distance between two objects, `d = ?` `lamda = 5000 Å = 5 xx 10^-5 cm` Limit of resolution `d theta = (d)/(x) = (lamda)/(D)` `:. d = (x lamda)/(D) = (10^5 xx 5 xx 10^-5)/(10) = 0.5 cm = 5 mm`. |
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