Physics CAT3

Physics CAT3

1. Light reflecting off plane mirror

   • When a ray of light strikes a plane mirror, the light ray reflects off the mirror.

2. The idea of virtual image

   • An image in which the rays of light appear to be giving off from some object that isn’t there.

3. Light travels in a straight line at a finite speed in a uniform medium.

4. Light is refracted at the boundary between two different materials.

5. White light can be dispersed by a prism to give a range of colours.

6. Primary colours can be projected onto a screen and combined to make magenta, yellow, cyan and white light.

7. Sounds are caused by vibrations and also require a medium to travel through-unlike light.

8. Sound waves cause the eardrum to vibrate .