Optical Instruments: Microscope

The expression for magnifying power of compound microscope is

What is the relation between visual angle and apparent size.

Define visual angle. 

What is the relation between visual angle and Apparent size

What is the unit of visual angle.

What angle subtended is the minimal visual acuity

The magnifying power of a compound microscope can be increased by

Total magnification of compound microscope is $20$ while magnification for eye piece is $5$. If final image is formed at near point which is taken $20 \mathrm{cm}$ then focal length of eye piece is

It the focal length of objective lens is increased then magnifying power of :

In a compound microscope, the intermediate image is

The focal length of the objective of a microscope is

Final image obtained from a compound microscope is-

The value of distance $d$ so that final image is formed on the object itself is ___ .

A compound microscope consists of an objective lens with focal length $20 \mathrm{c}\mathrm{m}$ the magnification will be

A convex lens of focal length 12.5 cm is used as a simple microscope. When the image is formed at infinite, Magnification is ______ (Near point for the normal vision is 25 cm).

The objective lens and eye piece lens of a compound microscope have focal lengths 1.5 cm and 5 cm respectively. The object is placed at a distance 1.8 cm. What is its magnification?  ( Take the least distance of distinct vision = 24 cm)

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

In a compound microscope, the intermediate image is:

The magnifying power of a compound microscope is high if,