1.

Calculate the least value of the angular separation of two stars which can be resolved by a telescope of 200 cm aperture. If the aperture of the human eye be 2mm and if the focal length of the eyepiece be 1 inch, what must be the minimum focal length of the objective if full resolving power of the telescope is to be utilized. Take lambda = 5500 A^(0).

Answer»

`6.7xx 10^(-7)RAD, 500` INCHES
`1.65xx 10^(-7)rad, 1000` inches
`3.35xx 10^(-7)rad, 1000` inches
none

Answer :C


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