Ray Model of Light (Lesson 2)

Ray Model of Light

Lesson TWO

Complete Pg 9&10 of Activity Book

What is a PLANE mirror?

The diagram on the right is an example of a plane mirror.

There are FIVE characteristics of images formed by plane mirror.

To say that you have learnt well.... you need to remember all FIVE by the end of this lesson.

Poll

Have you seen yourself in the mirror?

• Yes, but I don't know how to describe my image.

• Of course and I know how to describe my image.

• No, I don't observe my image in the mirror.

1. Image is the same size as the object.

Look at yourself in the mirror.

Multiple Choice

Characteristics of image formed by mirror. Choose the correct one.

• Image is the same size as object.

• Image is larger than the object.

• Image is smaller than the object.

2. The distance from object to mirror is equal to the distance of image to mirror.

look at a = b in the diagram

Multiple Choice

Characteristics of image formed by mirror. Choose the correct one.

• The distance of image to mirror is smaller than the distance of object to mirror.

• The distance of image to mirror is larger than the distance of object to mirror.

• The distance of image to mirror is equal to the distance of object to mirror.

Multiple Choice

If the distance of the object to the mirror is 2 cm, what is the distance of the image to the mirror?

• 1 cm

• 2 cm

• 3 cm

• 4 cm

3. Image is laterally inverted.

When you raise your right hand, it looks like your left in the mirror! Have a try at it.

Multiple Choice

The image of an object in a plane mirror is....

• inverted

• vertically inverted

• laterally inverted

• horizontally inverted

Multiple Choice

Which diagram shows the correct image of the object?

4. Image is upright.

This means.... your head is still up there, and your feet is at the bottom. You are NOT INVERTED.

Multiple Choice

The image of an object in a plane mirror is....

• upright

• inverted

5. Image is virtual.

Cannot be captured on a screen, or NOT REAL!

Multiple Choice

The image cannot be captured on a screen. It means the image is

• real

• virtual

Turn to Activity Book Page 9 Question 3 to tick the correct answers. Once you are done, you may check the answers on the next slide.

Multiple Select

Test yourself again! Which are the correct descriptions of image formed by a plane mirror? Choose 2.

• The image is real.

• The image is virtual.

• The image is inverted.

• The image is diminished.

• The image is laterally inverted.

Multiple Select

Which of these are true about images formed by a plane mirror? Choose 2.

• The image is the same size as the object.

• The image is larger than the object.

• The distance between the image and the mirror is equal to the distance between the object and the mirror.

• The distance between the image and the mirror is different from the distance between the object and the mirror.

Complete the next 2 questions in Activity Book Page 10.

What is the distance between the image of the chart and the mirror?

Did you get it right?

Answer should be 3.5 m.

Did you think of this:

3.5 m + 2.5 m = 6.0 m

Can you picture how the image will look like?

Can you find the correct image for Q5 on Pg 10?

Pg 10 Q5

Open Ended

Name two characteristics of image formed by plane mirror.

(You must be able to recall!)