A compound microscope has a magnifying power of `100` when the image is formed at infinity.

A simple microscope has a magnifying power of 3.0 when the image is formed at the near point (25 cm) of a normal eye. (a) What is its focal length? (b) What will be its magnifying power if the image is formed at infinity?

A simple microscope has a magnifying power of 4.125, when the image is formed at the distance of distinct vision. What is the focal power of the lens ?

A compound microscope has a magnifying power of 35. Assume that the final image is formed at DDV (25 cm). If the focal length of eyepiece is 8 cm, the magnification produced by objective is

The focal lengths of the eye piece and objective of a compound microscope are 5 cm and 1 cm respectively, and the length of the tube is 20 cm . Calculate magnifying power of microscope when the final image is formed at inifinity. The least distance of distinct cision is 25 cm .

The focal length of the objective and eye piece of a telescope are respectively 60 cm and 10 cm . The magnitude of the magnifying power when the image is formed at infinity is

The focal length of objecive and eye-piece of astronomical telescope are 2 m and 5 cm respectively. The magnifying power of telescop when final image is formed at infinity is

A convex lens of focal length 5 cm is used as a simple microscope. What will be the magnifying power when the image is formed at the least distance of distinct vision ?

A telescope has objective and eyepiece lenses of focal lengths 150 cm and 5 cm, respectively. Calculate the magnifying power of telescope when the final image is formed (a) at infinity and (b) at the least distance of clear vision.