NEET Physics Ray Optics and Optical Instruments Questions Solved

NEET - 2015

In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is l. The magnification of the telescope is





We know,magnification of telescope,we have


Here, =>fe/fe+u=-l/L

=> fo/fe-(fo+fo)=-l/L


i.e. M=L/l

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