Geometric Optics

It causes the light rays to diverge.

It causes the light rays to converge at a focal point.

It has no effect on the light rays.

It bends the light rays into a parallel beam.

It cannot be viewed directly.

It can be projected onto a screen.

It is always upright.

It is formed by diverging light rays.

-20 cm

20 cm

-10 cm

2 cm

It converges the light rays to a single point.

It diverges the light rays, spreading them out.

It focuses the light rays on the same side of the lens.

It has no effect on the light rays.

The object distance ($s_o$) is negative.

The image distance ($s_i$) is always positive.

The focal length ($f$) is negative.

The object distance ($s_o$) is positive.

It is formed by converging light rays.

It can be projected onto a screen.

It appears on the opposite side of the lens from the object.

It cannot be projected onto a screen.

10 cm

20 cm

30 cm

40 cm

At a distance further than twice the focal length.

Exactly at the focal length.

At a distance less than the focal length.

At twice the focal length.

Farsightedness

Astigmatism

Nearsightedness

Presbyopia

Looking at your reflection in a flat mirror.

Using a magnifying glass to view an object.

A movie projector displaying an image on a screen.

Looking through a peephole in a door.