1.

A small object is placed at distance of 3.6 cm from a magnifier of focal length 4.0 cm. a. find the position of theimage. B. find the linear magnification c. Find the angular magnification.A. 10B. 7C. 5D. None of these

Answer» Correct Answer - B
If the object is placed at a distance `u_(0)` from the lens, the angel subtended by the object on the lens is `beta = (h)/(u_(0))` where h is the height of the object. The maximum angle subtended on the unaided eye is `alpha = (h)/(D)`
Thus, the angular magnification is
`m = (beta)/(alpha) = (D)/(u_(0)) = (25 cm)/(3.6 cm) = 7.0`


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