Ray Model of Light - Reflection

Ray Model of Light - Reflection

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Recap Quiz : )

Most objects don't emit light of their own, so how do we see them?

We can only see objects like these in the presence of a light source.

Light from a light source can bounce of an object and enter our eyes. This bouncing of light off a surface is called reflection.

Light still travels in straight lines when it is reflected.

The reflection of light allows the girl to see the flower.

Multiple Select

Which objects would be able to see in a room that is completely dark?

• a white ball

• a black ball

• a red ball

• none of the objects

When water is very still, we can see very clear images due to the reflection of light

Try this out

Turn off your phone screen, and look at the reflection of your face

Look again, but this time take note of:

• The size of the image

• The orientation of the image (upright? upside down? left to right?)

Your screen acts as a plane mirror

- a mirror with a flat surface.

In Scientific terms,

Your actual face is called an object, while the face in the mirror is called an image.

The image of your face in the mirror was:

• the same size as the object (your actual face)

• upright

• laterally inverted

• virtual

• as far from the mirror as you were from the mirror

Lateral inversion

When the person raises his right hand, it seems like the image raises its left hand.

Images can be real or virtual.

A virtual image is only formed in the mirror, and not formed on a screen. A real image, however, can be formed on a screen.

If you happen to have a concave mirror lying around you can make real images appear on a screen.

You can also buy these mirascopes online to play with real images.

(video on next slide)

The distance between the object and the mirror (a) is equal to the distance between the image and the mirror (b).

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One more time: images in plane mirrors are:

• the same size as the object

• upright

• laterally inverted

• virtual

• as far from the mirror as the object is from the mirror

Let's see how much you understood.

Yay more quiz questions :D

Have you noticed that ambulances seem to have printed the word 'ambulance' wrongly?

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It's not an error.

It's actually because the word will look correct when reflected in a plane mirror.

Multiple Choice

The ambulance we see in a mirror is called an

• image

• object

Multiple Choice

The size of the word 'ambulance' in the mirror will be

• bigger than the word on the object

• smaller than the word on the object

• the same as the word on the object

Multiple Choice

The orientation of the word 'ambulance' in the mirror will be

• upright

• upside down

Multiple Choice

The image of the word 'ambulance' in the mirror is

• real

• virtual

Multiple Choice

The word 'ambulance' will look correct in mirrors because it is

• laterally inverted

• upside down

Multiple Choice

The distance of the ambulance from the mirror is _______ the distance of the image from the mirror.

• more than

• less than

• equal to

We're done for today.

Yay.