A telescope consists of two lenses of focal lengths `10cm` and `1cm`. Calculate the length of the telescope, when an object is kept at a distance of `60cm` from the objective, and the final image is formed at least distance of distinct vision.

A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm . Calculate the magnification, if an object is kept at a distance of 5 cm from the objective so that final image is formed at the least distance vision (20 cm)

A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm . Calculate the magnifcation, if an object is kept at a distance of 5 cm from the objective so that final image is formed at the least distance vision (20 cm)

A compound microscope consists of two convex lenses having focal length of 1.5cm and 5cm. When an object is kept at a distance of 1.6cm from the objective, the final image is virtual and lies at a distance of 25cm from the eyepiece. Calculate magnifying power of the compound microscope in this set-up.