Question: A refracting astronomical telescope has an objective lens 50 mm in diameter. Given that the instrument has a magnification of 10 , determine the diameter

A refracting astronomical telescope has an objective lens 50 mm in diameter. Given that the instrument has a magnification of 10 ×, determine the diameter of the eye-beam (the cylinder of light impinging on the eye). Under conditions of darkness the acclimated human eye has a pupil diameter of about 8 mm.

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