Science Study Guide Flash Cards

Front 1

lens are .....

Back 1

A piece of transparent material that can bend, or refract light rays.

Front 2

concave lenses

Back 2

Thinner in the middle than at the edge. They are used to diverge light rays. (ex. eyeglasses, telescopes)

Front 3

How does the image that the concave lens forms looks like?

Back 3

The image is upright and smaller than the object.

Front 4

convex lenses

Back 4

Thicker in the middle than at the edge. They are used to converge light rays. (ex. magnifying glass)

Front 5

What happens to the light ray when it passes from air into glass?

Back 5

It bends toward the normal.

Front 6

What happens to the light ray when it passes from water into air?

Back 6

It bends away from the normal.

Front 7

What happens to the light ray when it passes from air into water?

Back 7

It bends toward the normal.

Front 8

What happens to the light ray when it passes from a transparent plastic into air?

Back 8

It bends away from the normal.

Front 9

What happens to the image if the object is more than two focal length in front of the lens?

Back 9

The image is smaller than the object and inverted.

Front 10

What happens to the image if the object is one to two focal length away from the lens?

Back 10

The image is larger than the object and inverted.

Front 11

What happens to the image if the object is less than one focal length away from the lens?

Back 11

The image is located on the other side of the lens and is upright and larger than the object.

Front 12

focal length

Back 12

The distance from the center of the lens to the focal point.

Front 13

List two factors that affect the way that light is refracted through a lens.

Back 13

1. The shape of the lens. (convex/concave)

2. The distance between the object and the lens.

Front 14

What will happen if the object is directly at the focal point?

Back 14

There will be no images.

Front 15

absorbed

Back 15

Become "trapped".

Front 16

the angle of incidence (i)

Back 16

The angle formed by the incident beam and the normal.

Front 17

the angle of reflection (r)

Back 17

The angle formed by the reflected beam and the normal.

Front 18

the angle of refraction (R)

Back 18

The angle of a ray of light emerging from the boundary between two materials, such as from air into glass, measured between the refracted ray and the normal.

Front 19

incident ray

Back 19

The incoming ray.

Front 20

law of reflection

Back 20

The angle of reflection equals the angle of incidence.

Front 21

mirage

Back 21

The refraction of light through air.

Front 22

normal

Back 22

An imaginary line that is perpendicular to the boundary between two materials (such as air and glass) and intersects the point at which the incident ray reaches the boundary.

Front 23

opaque

Back 23

All or most of the light is absorbed or reflected so thatnone of the light passes through. (ex. a book, a metal can, and a wall.)

Front 24

particle model of light

Back 24

A lantern flame was thought to release tiny particles of light, which travelled in a perfectly straight line until they entered an eye, where they were absorbed to make an image.

Front 25

ray

Back 25

An imaginary line showing the direction in which light is traveling.

Front 26

ray diagram

Back 26

Shows how the distance from the light source affects the size of the shadow that an object makes.

Front 27

ray model of light

Back 27

Light is simply represented as a straight line, or ray, that shows the direction the light wave is travelling in this model.

Front 28

reflected

Back 28

Bounce off.

Front 29

reflected ray

Back 29

The ray that bounces off the barrier.

Front 30

translucent

Back 30

Only some of the light is transmitted, and that light isscattered in all directions. (ex. waxed paper, clouds, and lampshades.)

Front 31

transmitted

Back 31

Pass straight through.

Front 32

transparent

Back 32

All or most of the light is transmitted. (ex. clear glass, air, and water.)

Front 33

What happens when light reflects from a plane mirror?

Back 33

When light reflects from a plane (flat) mirror, the rays of light bounce off the mirror in a regular pattern.

Front 34

What is the relationship between the size of the shadow and the distance of the object from the light source?

Back 34

The object casts a larger shadow when it is closer to the light source. The object casts the smaller shadow when it is farther from the light source.

Front 35

What three things can happen to light when it strikes a material?

Back 35

Transmitted, reflected or absorbed.

Front 36

What will happen if light rays slow down as they refract?

Back 36

They will bend toward the normal.

Front 37

What will happen if light rays speed up as they refract?

Back 37

They will bend away from the normal.