Refraction and Lenses

Reflection is the change in direction of a wave as it changes speed while moving from one medium to another.

A lens is a transparent object with at least one curved side that causes light to change direction.

The more curved the sides of a lens, the less the light changes direction as it passes through the lens.

A concave lens is curved outward on at least one side so it is thicker in the middle.

The light rays converge (comes to a single point) as they pass through the convex lens.

When an object is farther than one focal length from a convex lens, the image is upside down.

When an object is less than one focal length from a convex lens, the image is smaller and upside down.

A concave lens is curved inward on at least one side and thicker at the edges.

Concave lenses are usually used in combinations with other lenses in instruments such as telescopes and microscopes.

Each color of light has a different wavelength and frequency.

Waves with longer wavelengths travel at slower speeds in the material than waves with shorter wavelengths.

The cornea is a concave lens made of transparent tissue located on the outside of the eye.

The iris is the dark opening into the interior of the eye.

The iris is the colored part of the eye.

When the iris changes size, the amount of light that enters the eye changes.

What is the name of the part in the eye that is labeled A from the picture below?

A.Corena

B.Iris

C.Optical nerve

D.Pupil

What is the name of the part in the eye that is labeled B from the picture below?

A.Pupil

B.Lens

C.Retina

D.Cornea

What is the name of the part in the eye that is labeled C from the picture below?

A.Retina

B.Iris

C.Lens

D.Cornea

What is the name of the part in the eye that is labeled D from the picture below?

A.Iris

B.Lens

C.Cornea

D.An Eye

What is the name of the part in the eye that is labeled E from the picture below?

A.Retina

B.Optic nerve

C.Lens

D.Pupil

What is the name of the part in the eye that is labeled F from the picture below?