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7. You have 2 convex lens (fi = 20 cm and f 6 cm) and you want to build a microscope a) Which lens should be the objective? W

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objective lens is of short focal length. It is placed close to the object. It forms a real image of the object at the focal point of the lens.

Object lens f = 6 cm ; eyepiece f = 20 cm

b) magnification of eyepiece Me = 25/20 = 1.25

Total magnification = Mo * Me = 3.125

Magnification of the objective lens Mo = 3.125/1.25 = 2.5

= d/fo

d = 2.5 * 6 = 15 cm , distance between the lenses

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