When the image is formed at the near point ( 25 cm ) of a normal eye, a simple microscope exhibits a magnifying power of 3.0 . Calculate the magnifying power of this microscope if the image is formed at infinity.

Step-by-step solution

The magnifying power of a simple microscope when the image is formed at the near point D is given by m = 1 + D f . Given m = 3.0 and D = 25 cm , we have: 3.0 = 1 + 25 f 25 f = 2.0 The magnifying power when the image is formed at infinity is given by m_ = D f . Substituting the value of 25 f , we get: m_ = 2.0