In optical instruments, the lenses are used to form image by
the phenomenon of

In optical instruments, the lenses are used to form images by

In all optical instruments, we use.

The optical instrument with zero power is

In which optical instruments, combination of lenses is used ?

Optical fibres make use of the phenomenon of

Optical fibres make use of the phenomenon of

A camera is an optical instrument which makes use of a

Optical instrument||Compound telescope

Combination of lenses are used in optical instruments to obtain the required power. What do you mean by power of a lens ? Express its unit.