1 • Reflection of Light

Define Reflection

When light strikes a smooth surface, it bounces back from that surface

Define the laws of reflection

1. Incident ray, reflected ray and normal all lie on the same plane

2. Angel of incidence = Angle of reflection

What is the conclusion from the laws of reflection?

Plane mirror image is a far behind as the object

Label This Formula

Ray Diagrams

a - incident ray

b - reflected ray

c - normal

d - angle of incidence - r

e - angle of reflection - i

Name the types of images in a plane mirror

Real

Virtual

Define Real Image

The actual intersection of light rays

Define Virtual Image

The apparent intersection of light rays

Name the types of curved mirrors

Concave

Convex

Name the type of curved mirror in this image

Concave

Name the type of curved mirror in this image

Convex

Label This Diagram

Curved Mirror

P - Pole

F - Focus

c - Centre of curvature

f - Focal length

Differentiate between Concave & Convex mirrors

Concave has a real focus

Convex has a virtual focus

What happens to a light ray parallel to the axis?

Reflects through the focus

What happens to a light ray striking the pole?

Reflects at the same angle

What happens to a light ray reflecting through the focus?

Reflected parallel to axis

What type of image is formed in this diagram?

Concave Mirror - Object outside C

Real

Inverted

Diminished

What type of image is formed in this diagram?

Concave Mirror - Object at C

Real

Inverted

Same Size

What type of image is formed in this diagram?

Concave Mirror - Object between C & F

Real

Inverted

Magnified

What type of image is formed in this diagram?

Concave Mirror - Object at F

Real

Inverted

At Infinity

What type of image is formed in this diagram?

Concave Mirror - Object inside F

Virtual

Upright

Magnified

What type of image is formed in this diagram?

Convex Mirror

Virtual

Upright

Diminshed

Label This Formula

The Distance Formula

v - image distance

u - object distance

f - focal length

When is u positive and negative?

U is always positive

Never negative

When is v positive and negative?

Positive - Real Images

Negative - Virtual Images

When is f positive and negative?

Positive - Concave Mirrors

Negative - Convex Mirrors

Label This Formula

Magnification Formula

m - magnification

v - image distance / height

u - object distance/ height

When is magnification positive and negative?

Positive - Upright

Negative - Inverted

Name 2 uses of concave mirrors

1. Shaving Mirrors

2. Dentist Mirrors

Name 2 uses of convex mirrors

1. Driving mirrors

2. Supermarket mirrors

Define Parallax

The difference in the apparent position of an object viewed through two different lines of sight