The magnifying power of a simple microscope increases when the focal length of its lens is:

A rainbow is formed due to the:

A concave mirror can produce:

Myopia occurs when the eyeball is:

The power of a convex lens is considered:

The human eye lens is:

Which of the following travels fastest in vacuum?

The critical angle is the angle of incidence for which the angle of refraction is:

The SI unit of electric current is:

Which mirror is used as a rear-view mirror in vehicles?

The SI unit of electric charge is: