Light can be reflected

1. Reflection of light occurs light rays hit the surface of an opaque or translucent object and bounce off the surface.
2. A ball  bouncing on the ground is an analogy of light reflecting off the surface of an object.

3. Reflection of light enables us to look at objects.
4. Whe light is reflected, its direction also changes.
5. When you look in amirror, you see your image in the mirror.
     a) The light from a light source travels in straight lines and fall on you.
     b) This light is reflected off you and onto the mirror. Your image is formed in the mirror.
     c) The mirror then reflects the image into yuot eyes.
6. The images formed in a mirror are
     - upright
     - the same size as the object
     - laterally inverted

a) reflection of light in a mirror

b) formation of image in a mirror

A Magical Hand Shadows Show

Test Yourself

1. How can you prove that light travels in straight lines?

2. If you stand in a football field in the morning, what is the characteristic of your shadow?

3. Wayang kulit is a shadow puppet play? How is this performed?

UPIN & IPIN

Experiment: to investigate the factor that produce the shape of a shadow

What Do You Need?
Mug, torch, white screen. pencil

What Do You Do?
1. Use a coffee mug as the object
2. Align a torch with the coffee mug.
3. Draw the shape of the shadow produced on the screen.
4. Then, tilt the coffee mug so that it rest on its side and its handle faces upwords.
5. Draw the shape of the shadow produce on the screen.
6. Then turn the coffee nug so that its mouth faces the screen and its bottom faces the torch
7. Shine the torch on the bottom of the coffee mug.
8. Draw the shape of the shadow.

What Do You Find?
The shape of the shadow changes with the changes of the possition of the object and the source of light.

What Do You Conclude?
The shape of a shadow depends on the position of the source of the light and the position of the object.

Shape of shadows

1.Remember that shadows are the dark shapes formed on a surface.
2. Therefore, the shape of the shadow depends on:
     i. the position of the source of light.
     ii. the position of the object.
3. The shape of the shadow is similar to the outline of the object