Refraction

Refraction

As a light wave moves from one medium into another, its speed changes

Multiple Choice

As a light wave moves from a faster medium to a slower medium, its speed

• does not change

• slows down

• speeds up

If the wave enters the new medium at an angle, the wave will change direction

Multiple Choice

When a wave enters a new medium AT AN ANGLE the wave

• continues in the same direction

• changes direction

Multiple Choice

When a light wave enters a new medium straight (at a 90^o angle) the wave

• continues in the same direction

• changes direction

Refraction

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

Multiple Select

Choose all examples of refraction

Poll

Position A is where the fish is actually located. Because of refraction, where does the fish APPEAR to be?

• A

• B

• C

Other examples of refraction

prisms

Diamonds

Rainbow

Refraction and lenses

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

Convex Lens: Light rays that move through a convex lens come together or converge. Convex lenses are also called converging lenses.

​Convex lens images

Concave Lens: as light rays move through a concave lens, they spread apart, or diverge. Concave lenses are often called diverging lenses.

​Concave lens images

Multiple Choice

The point where light rays converge to a point is called the

• middle point

• critical point

• focal point

Multiple Choice

A __________ lens DOES produce a focal point but a __________ lens DOES NOT.

• concave

  convex

• opaque

  translucent

• convex

  concave