The magnifying power of a simple microscope is 6
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A)The magnifying power of a simple microscope is 6. The focal length of its lens in meters will be ? (Least distance of distinct visionis 25cm)
A. 0.05
B.0.06
C.0.25
D.0.12
B) the focal length of one lens is -40 cm and that if the other is +20 cm . The foxal length of this combination wil be
A.15.2cm
B.40cm
C.-40cm
D.35cm