8.3 REFLECTION OF LIGHT

8.3 REFLECTION OF LIGHT

by KASMAWATI Moe

Light reflection

What is a light wave?

• Tiny particles called photons moving very fast.

How are we able to see things?

• Light travels in a straight line to an object, bounces off, then travels back to the human eye. We can see!

Characteristic of a light wave

• Travels in a straight line

• Travels very, very fast

Types of light

• Natural light: made from Earth

• Artificial light: made by man

Properties of a light wave

• Reflection: light bounces off the object

• Refraction: bending of light - when the light moves from one medium to another (air to water)

• Transmitting: light goes through an object

• Absorbing: Light soaks into something

How does light travel through objects?

• tranparent: all light travels through the object.

• translucent: some light travels through the object.

• opaque: no light travels through the object

How do sunglasses help us see?

• When light hits an object, the light reflects and enters our eyeballs.

• If the light that is reflected is super bright, we may have to close our eyes or shade our eyes.

• OR.... WEAR SUNGLASSES!!!

Multiple Choice

The ray of light that strikes a reflecting surface is called ________.

• incident ray
• reflected ray
• normal ray
• none of the above

Multiple Choice

Light travels in ___________ lines

• wavy
• bent
• straight
• backwards

Multiple Choice

If the angle of incidence is 45 degree, what is the angle between the incident ray and reflecting surface

• 45
• 90
• 180
• none of the above

Multiple Choice

The imaginary line perpendicular to a reflecting surface is called _____.

• crooked line
• parallel line
• angular line
• normal line

Multiple Choice

what is the angle between the incident ray and the normal called as

• angle of incidence
• angle of reflection
• angle of convergent
• angle of divergent

Multiple Choice

Law of reflection state that - The angle of incidence is .................. to the angle of reflection.

• equal
• double
• half

Multiple Choice

What is reflection?

• Reflection is the bouncing  of light off the surface that it strikes on.
• Reflection is the absorbing of light off the surface that it strikes on.
• Reflection is the bending of light off the surface that it strikes on.
• Reflection is the scattering of light off the surface that it strikes on.

Multiple Choice

The ray of light that strikes a reflecting surface is called ________.

• incident ray
• reflected ray
• normal ray
• none of the above

Multiple Choice

The angle produced as a source of light bounces off a reflecting surface is called ______.

• angle of crookedness
• angle of reflection
• angle of incidence
• angle of bounce

Multiple Choice

Why can you see most objects? 

• they emit light
• light refracts through them
• light reflects off them
• They absorb light

Multiple Choice

What is the line MN called in the given diagram
                               

• incident ray
• reflected ray
• reflecting surface
• normal

Multiple Choice

what is the angle between the reflected ray and the normal called as

• angle of incidence
• angle of reflection
• angle of convergent
• angle of divergent

Multiple Choice

What does incidence angle equal?

• reflection angle
• ∠C
• ∠D
• all of these

Multiple Choice

Which is the process of reflection of light

• When light falls on a highly polished surface like a mirror most of the light is sent back in to the same medium.

• When light travels at an angle into a substance with a different refractive index (optical density).

Multiple Choice

When light reflects on a rough surface ,the reflected rays will travel in the same direction.

• True

• False

Multiple Choice

When light hits an area and it bounces back its called

• echo

• reflection

• refraction

• absorbing

Multiple Choice

Light travels through air,water,glass and many other materials.What path does it travel to get from one place to another?

• sideways

• straight

• back and forth

• up and down

Multiple Choice

What is the best explanation for Mickey seeing himself in the mirror?

• refraction

• reflection

• absorbed

• flipped

Multiple Choice

The law of Reflection:

The angle of incidence is________the angle of reflection

• bigger than

• smaller than

• the same as

Multiple Choice

The diagram shows

• refraction of light.

• absorption of light.

• reflection of light.

• scatter of light.

Multiple Choice

Which is the reflected ray?

• A

• B

• C

• D

Multiple Choice

Which diagram represents specular reflection?

• A

• B

Multiple Choice

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

• A

• B

• C

• D

Multiple Choice

According to the laws of reflection,

if i = angle of incidence and r = angle of reflection,

• i = r

• i > r

• r > i

• i is not equal to r

Multiple Choice

The following diagram shows the ray diagram when a torch light is torched towards a mirror. Which of the following is the correct reflected ray?

Multiple Choice

The following diagram shows a driver who could see the image of a vehicle behind him without turning his back.

Why?

• Light travels in a straight line

• Light is refracted

• Light is reflected

• Light travels in two different mediums

Multiple Select

Tick the correct of TWO devices which use the principle of light reflection in our daily lives.