Light

LIGHT

Cross out the sources of light.

​What would be the results of this experiment?

Why?

Multiple Choice

How do light rays travel?

• bent lines

• straight lines

How do we see things?

Multiple Choice

Do all objects reflect light?

• no

• yes

How do these 2 objects reflect light?

Why do you think mirrors can reflect light?

Microscopic View

Multiple Choice

What will be the type of reflection if light falls on a book?

• diffuse reflection

• specular reflection

How plane mirrors reflect light?

Multiple Choice

According to the law of reflection, when the light rays fall on the smooth surface, the angle of reflection is ___________ the angle of incidence,

• equal to

• less than

• more than

Multiple Select

Which two diagrams are incorrect?

• A

• B

• D

• E

• F

Multiple Choice

Which diagram shows the periscope?

• A

• B

• D

• E

• F

Multiple Choice

If the angle of incidence is 50 degrees. Find the angle between the incident ray and reflected ray.

• 30 degrees

• 40 degrees

• 50 degrees

• 90 degrees

Label the diagram.

Real vs Virtual Image

Multiple Choice

Watch the video clip. Is it a real or virtual image?

• real

• virtual

Multiple Choice

Watch the video clip. Is it a real or virtual image?

• real

• virtual

Multiple Choice

Watch the video clip. Is it a real or virtual image?

• real

• virtual

Multiple Choice

Watch the video clip. Is it a real or virtual image?

• real

• virtual

Multiple Choice

We see objects when light ____________ from them reaches our eyes

• erect

• real

• light

• reflected

• virtual

Multiple Choice

Mirror can change the direction of __________.

• erect

• real

• light

• reflected

• virtual

Multiple Choice

An image formed by a plane mirror is _________ and the same size as the object.

• erect

• real

• light

• reflected

• virtual

Multiple Choice

Image of our face in a plane mirror is ___________ image.

• erect

• real

• light

• reflected

• virtual

Spherical Mirrors

Concave mirrors (curve inward in the middle)

Convex mirrors (curve outward in the middle)

Multiple Choice

Which mirror will be used by the dentists to see magnified image of the insides of our mouth?

• concave

• convex

Multiple Choice

Which mirror will be used in telescopes?

• concave

• convex

Multiple Choice

Which mirror will be used in rear view mirrors?

• concave

• convex

Refraction

How to bend light?

By using a mirror

But what if I want to continue the light downwards, can you still bend it?

Why?

Light will only travel in a straight line in ONE MATERIAL. So from air to glass, the light bends (REFRACTION).

Daily examples of refraction

Why? Because there is a change in the speed of light which causes the bending of light

Let's label the parts.

How can you compare the angle of incidence with the angle of refraction?

Multiple Choice

What happens to the speed of light in the image?

• It becomes faster.

• It becomes slower.

• It is the same.

Multiple Choice

When light travels from water to air, in which direction does light bend?

• going towards the normal line

• bounces away from the point of incidence

• going away from the normal line

• angle should be equal to the angle of incidence