Define the following : least distance of distinct vision

What is least distance of distinct vision?

The least distance of distnct vision is ………… .

What is meant by least distance of distinct vision?

with the help of labelled diagram, explain the formation of final image at least distance of distinct vision in case of astronomical telescope. Define its magnifying power and derive an expression for its magnifying power.

A compound microscope has a magnification of 30. The focal length of its eye-piece is 5 cm. Assuming the final image to be formed at least distance of distinct vision (25 cm),calculate the magnification produced by the objective.

A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15 cm. How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision (25 cm)? What is the magnifying power of the microscope in?

Least distance of distinct vision of a normal eye is:

Draw a labelled diagram of human eye and explain the terms :far point ,Power of accommodation , persistence of vision and the least distance of distinct vision for a human eye.