an astronomical telescope has an objective lens whose power is 4 diopters this lens is placed 30 cm from the eyepiece when the telescope is adjust for minimum eye strain find the angular magnification of the telescope
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While the v is given as 30 cm. So, the focal length of the eye piece will be 1/fe = 1/v - 1/u or 1/f = 1/(30) -1/(-25) which on solving we will get 1/f = 22/300 which on solving we will get 13cm approximately as the focal length of the eye piece.
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