Unit 2 Terminology PW2

Question 1

Law of Reflection

Answer 1

an incident wave or particle will reflect at the same angle that it hit a barrier.

Question 2

Regular Reflection

Answer 2

All rays in a beam of light are reflected at the same angle (smooth objects).

Question 3

Diffuse Reflection

Answer 3

when the rays in a beam of light are scattered off a surface.

Question 4

Reflex Reflection

Answer 4

when an incident ray is reflected back the way it came

Question 5

Normal

Answer 5

a line that is perpendicular to the point of incidence.

Question 6

Plane Mirror

Answer 6

Flat mirror

Question 7

Point of incidence

Answer 7

The point where the light hits the mirror

Question 8

Angle of Incidence

Answer 8

the angle between the normal and the incident ray.

Question 9

Angle of Reflection

Answer 9

the angle between the normal and the reflected ray.

Question 10

Virtual Images

Answer 10

an image light only appears to pass through.

Question 11

Reflected ray

Answer 11

the incident angle after reflection

Question 12

Curved Mirrors

Answer 12

Several tiny plane mirrors at slightly different angles.

Question 13

Concave Mirrors

Answer 13

A curved mirror with a rough outside, converging mirror.

Question 14

Convex Mirrors

Answer 14

A curved mirror with a rough inside, diverging mirror.

Question 15

Vertex (v)

Answer 15

the geometrical center of a curved mirror.

Question 16

Center of Curvature (C)

Answer 16

the geometrical center of the sphere the mirror is made from.

Question 17

Principal Axis

Answer 17

a line that passes through the center of curvature and the vertex.

Question 18

Radius of Curvature (R)

Answer 18

the distance from the center of curvature to the vertex.

Question 19

Focal Point (F)

Answer 19

a point on the principal axis halfway between C and V. Real on a concave mirror but virtual on convex.

Question 20

Focal Length (f)

Answer 20

distance between the focal point and the vertex.

Question 21

The principal rays for mirrors

Answer 21

1. A ray travelling parallel to the principal axis will reflect through the focal point.
2. A ray travelling through the focal point will reflect parallel to the principal axis.
3. A ray travelling through C will reflect back in the same direction.

Question 22

Convex Mirror Characteristics

Answer 22

All images will be smaller, upright, virtual, and between the f and V.

Question 23

Medium

Answer 23

the substance light is travelling through.

Question 24

Refraction

Answer 24

when light travels from one medium to another it bends.

Question 25

Index of Refraction (n)

Answer 25

a comparison of the speed of light in that substance with the speed of light in a vacuum.

Question 26

Interface

Answer 26

The point at which two media meet.

Question 27

Point of Incidence

Answer 27

The point in the interface where the light bends.

Question 28

Refracted Ray

Answer 28

the ray that leaves the interface through the second medium.A

Question 29

Angle of Refraction

Answer 29

the angle between the refracted ray and the normal.

Question 30

Snells Law

Answer 30

n1n2 the light will bend away from the normal.

Question 31

Critical Angle

Answer 31

the angle of incidence producing an angle of refraction of 90 degrees.

Question 32

Total Internal Reflection

Answer 32

When the angle of incidence is greater than the critical angle, the ray reflects.

Question 33

Lens

Answer 33

a transparent optical device with a clear lens.

Question 34

Converging lens

Answer 34

thicker in the middle than at the ends.

Question 35

Optical Center (O)

Answer 35

The center of the lense.

Question 36

Principle Focus (F)

Answer 36

the point that rays travelling parallel to the principle axis appear to converge through. Converging lenses its always on the opposite side the light comes from.

Question 37

Secondary Focus (F1)

Answer 37

the focal point on the opposite side of the lens as F. Same side as the light for a converging mirror.

Question 38

Construction Line

Answer 38

The normal for a lens.

Question 39

Real Images

Answer 39

in a lens, a real image will appear on the opposite side the light came from.

Question 40

Virtual Images

Answer 40

appears on the same side the light originated from in a lens.

Question 41

Diverging Lens

Answer 41

thinner in the middle than on the ends.

Question 42

Principle ray for Diverging Lenses

Answer 42

1. A ray travelling parallel to the principle axis will appear to refract from the principle focus.

Question 43

Principle rays for Converging Lenses

Answer 43

1. A ray travelling parallel to the principle axis will refract through the principle focus. 2. A ray travelling through the secondary focus will refract parallel to the principle axis. 3. A ray travelling through O will continue.