1.

An astrnomical telescope having angular magnification 5 consists of two thin lenses 24cm apart. Find the power of it's lenses.​

Answer»

magnifying POWER = 5             2 thin LENSES = 24 cm apart             fο + fe = 24             to find = focal length.   solution =   here we consider the fο and fe as a focal length of objects. fο + fe = 24cm       (.1) M = fο / fe = 5 fο = 5 fe                    (2) fe = 24cm / 6 = 4cm ___ from the above 2 equations fο= 5fe = 5(4cm) = 20cm the focal length of the lens​ is 20cm



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