Ray Optics and ...

The rays parallel and close to the principal axis are called:

A glass slab of thickness 18 cm and refractive index $$\dfrac {3}{2}$$ is placed on a printed matter. The normal shift of the printed matter is:

The distance between the extreme points on the periphery of the mirror is called:

The central point of a spherical mirror is called:

A plane mirror produces an image that is

Refer to the mirror formula, $$\dfrac {1}{v}+\dfrac {1}{u}=\dfrac {1}{f}$$, where the symbols have their usual meanings. Which of the following graphs correctly depicts this variation?

One cannot see through fog because:

Two points such that each focus for the rays proceedings from the other, are called :

The angle which subtends the periphery of the spherical mirror at the centre of curvature is called:

A bird is flying 12 m above the surface of pond. The apparent position of the bird as viewed by a fish 1 m below the surface is: