Mirrors

Question 1

Reflection Definition

Answer 1

The change in direction of a light ray when it bounces off a surface.

Question 2

How does light travel as long as it is moving through the same medium?

Answer 2

In a straight line.

Question 3

Medium Definition

Answer 3

The substance through which light travels.

Question 4

Ray Definition

Answer 4

A straight line with an arrowhead that shows the direction in which light waves are travelling.

Question 5

What does Fermat’s Principle predict?

Answer 5

The path that light will take after reflecting from a surface or passing through more than one medium.

Question 6

According to Fermat’s Principle. light follows the path that will take what?

Answer 6

The least time.

Question 7

When light reflects from a surface and remains in one medium, its speed is what?

Answer 7

Constant

Question 8

The path that takes the least time is the what path?

Answer 8

The shortest path.

Question 9

Fermat’s Principle leads to what?

Answer 9

The Laws of Reflection

Question 10

What is a ray of light coming toward a surface called?

Answer 10

Incident Ray

Question 11

Incident Ray Definition

Answer 11

A ray of light that travels from a light source toward a surface.

Question 12

What is the angle measured between the incident ray and a perpendicular line drawn from the point of contact of the incident ray at the surface called?

Answer 12

The angle of incidence

Question 13

Angle of Incidence Definition

Answer 13

The angle between the incident ray and the normal in a ray diagram.

Question 14

What is that perpendicular line called?

Answer 14

The Normal

Question 15

Normal Definition

Answer 15

A line that is perpendicular to a surface where a ray of light meets the surface.

Question 16

What begins at the point of contact?

Answer 16

The reflected ray

Question 17

Reflected Ray Definition

Answer 17

A ray that begins at the point where the incident ray and the normal meet.

Question 18

What is measured between the reflected ray and the normal?

Answer 18

The Angle of Reflection

Question 19

Angle of Reflection Definition

Answer 19

The angle between the reflected ray and the normal in a ray diagram.

Question 20

What lie on the same flat surface, or plane?

Answer 20

The incident ray, the normal, and the reflected ray

Question 21

When you know the angle of incidence, you can predict what because they are the same?

Answer 21

The Angle of Reflection

Question 22

The reflected ray always lies on the plane that is defined by what?

Answer 22

The Incident Ray and the Normal.

Question 23

What are these relationships called?

Answer 23

The Laws of Reflection

Question 24

The Laws of Reflection applies to what?

Answer 24

Light waves and to all other forms of waves, such as sound waves.

Question 25

What do the Laws of Reflection state?

Answer 25

1. The incident ray, the reflected ray, and the normal always lie on the same plane. 2. The angle of reflection is equal to the angle of incidence.

Question 26

What is the object placed in front of a mirror called?

Answer 26

An object.

Question 27

What is the likeness that is seen in the mirror called?

Answer 27

The image of the object.

Question 28

If you apply the laws of reflection to rays going from the object, you can predict what?

Answer 28

Where the image will be and what the image will look like; the characteristics of the image.

Question 29

Plane Mirror Definition

Answer 29

A mirror with a flat, reflective surface.

Question 30

What is the type of image where there are no light rays actually going to or coming from the image?

Answer 30

Virtual Image

Question 31

Virtual Image Definition

Answer 31

An image formed by rays that appear to be coming from a certain position, but are not actually coming from this position; image does not form a visible projection on a screen.

Question 32

What are the four characteristics of an image?

Answer 32

-Its location (closer than, farther than, or the same distance as the object to the mirror). -Orientation (Upright or inverted) -Size (Same size, larger than, or smaller than the object) -Type (Real image or virtual image)

Question 33

What are the characteristics of an image in a plane mirror?

Answer 33

-Same distance from the mirror as the object. -Same orientation as object (Upright) -Same size as the object -Virtual

Question 34

Concave Mirror Definition

Answer 34

A mirror whose reflecting surface curves inward.

Question 35

True or False: You can draw a normal at a point on a curved surface by applying the same rules of reflection for a plane mirror by thinking of the curved surface as many small, flat mirrors.

Answer 35

True

Question 36

What is the point at which all the normals meet called?

Answer 36

The Centre of Curvature

Question 37

What is the thick horizontal normal that touches the centre of the mirror called?

Answer 37

The Principal Axis

Question 38

Principal Axis Definition

Answer 38

On a concave mirror, the line that passes though the centre of curvature of the mirror, and is normal to the centre of the mirror.

Question 39

What is the point at which the principal axis cuts the centre of the mirror called?

Answer 39

The Vertex

Question 40

Focal Point Definition

Answer 40

The point on the principal axis through which reflected rays pass when the incident rays are parallel to and near the principal axis.

Question 41

Focal Length Definition

Answer 41

The distance between the vertex of a mirror and the focal point; half the distance from the vertex to the Centre of Curvature.

Question 42

What is the type of image called where the rays actually meet at the image?

Answer 42

Real Image

Question 43

Real Image Definition

Answer 43

An image that is formed when reflected rays meet.

Question 44

What are the characteristics of an Image for an Object between F and a Concave Mirror?

Answer 44

-Farther from the mirror than the object. -Upright -Larger than object -Virtual

Question 45

What are the characteristics of an Image for an Object between F and C?

Answer 45

-Farther from the mirror than the object (beyond C). -Inverted -Larger than object. -Real

Question 46

What are the characteristics of an Image for an Object beyond C?

Answer 46

-Closer to the mirror than the object (Between C and F). -Inverted -Smaller than object -Real

Question 47

What does the magnification of an image tell you?

Answer 47

The size, or height, of the image relative to the object using object and image distances.

Question 48

Magnification Definition

Answer 48

The change in size of an optically produced image.

Question 49

Spherical Aberration Definition

Answer 49

Irregularities in an image in a curved mirror that result when reflected rays from the outer parts of the mirror do not go through the focal point.

Question 50

Convex Mirror Definition

Answer 50

A mirror whose reflecting surface curves outward.

Question 51

What are the characteristics of an Image for an Object in a Convex Mirror?

Answer 51

-Closer to the mirror than object (between the mirror and F). -Upright -Smaller than object. -Virtual

Question 52

How to Draw a Ray Diagram for Image in Concave Mirror (3 Points)

Answer 52

-Incident ray parallel to principal axis is reflected through focal point. -Incident ray through focal point is reflected parallel to principal axis. -Incident ray through C is reflected back through C.

Question 53

How to Draw a Ray Diagram for Image in Convex Mirror (3 Points)

Answer 53

-Incident ray parallel to principal axis is reflected as if it came from f. -Incident ray heading to focal point is reflected parallel to principal axis. -Incident ray heading to C is reflected back along incident ray

Question 54

Characteristics of Images Based on Results from Calculations

Answer 54

Location: Depends on if image distance is greater or less than object distance Orientation: Image height is Positive if Upright; Image height is Negative if Inverted Size: Depend on if image height is greater or less than object height. Type: Real if image distance is positive; Virtual if image distance is negative