Ray Model of Light (Law of Reflection)

Ray Model of Light (Law of Reflection)

How do light rays behave when they undergo reflection?

Let's learn some important terms first!

• What is the normal line?

• What is the incident ray?

• What is the reflected ray?

• Where is the angle of incidence?

• Where is the angle of reflection?

Multiple Choice

The normal should be drawn using a __________ line.

• solid

• dotted

Multiple Choice

The normal is ___________ to the surface.

• perpendicular

• parallel

Multiple Choice

Which is the ray what strikes the surface?

• Incident ray

• Incidence ray

• Reflected ray

• Reflection ray

Multiple Choice

Which is the ray that is reflected off the surface?

• Incident ray

• Incidence ray

• Reflected ray

• Reflection ray

Law of Reflection

The angle of incidence is equal to the angle of reflection (i = r)

The incident ray, the reflected ray and the normal at the point of incidence all lie on the same plane.

Multiple Choice

What does the Law of Reflection state?

• The angle of incidence is larger than the angle of reflection.

• The angle of incidence is equal to the angle of reflection.

• The angle of incidence is smaller than the angle of reflection.

Multiple Choice

What is A?

• Angle of incidence
• Angle of reflection
• Incident ray
• Reflected ray

Multiple Choice

In the diagram, which letter represents the angle of incidence?

• B

• C

• D

• E

Multiple Choice

What is the line MN called in the given diagram

• incident ray

• reflected ray

• reflecting surface

• normal

Multiple Choice

The ray that bounces off the mirror.

• Angle of Reflection

• Incident Ray

• Reflected Ray

• Angle of Reflection

Multiple Choice

The ray of light that strikes a mirror.

• Reflected Ray

• Incident Ray

• Angle of Incidence

• Angle of Reflection

Multiple Choice

Zoom in to see question.

• A

• B

• C

• D

Multiple Choice

If the angle of reflection is 35 degrees, what is the angle of incidence?

• 35

• 55

• 90

• 0

Fill in the Blanks

Multiple Choice

In the given figure, which of the following is TRUE?

• The angle of incidence is 10°.

• The angle of incidence is 80°.

• The angle of reflection is 10°.

• The angle of reflection is 90°.

What happens when the reflecting surface is rough?

Smooth Surface

Regular Reflection

All light rays are reflected in the same direction

Clear images are formed

Rough Surface

Irregular / Diffused Reflection

All light rays are reflected in different directions

No image is formed

Multiple Choice

In which type of reflection will we be able to see an image?

• regular

• diffused

Multiple Choice

Which is a rough surface?

• mirror

• glass

• still water

• silk

Activity Book (1B)

Page 24, question 3

Draw this working in your diagram on Page 24

Complete Page 21, 22 and 23 of your activity book for homework