What happens when light hits an object?

1. What happens when light hits an object?

2. The Ray Model of Light A beam is a group of parallel rays. To trace the straight-line path that light travels, scientists use an arrow called a ray A light ray is a line and arrow representing the straight line path of light

3. What happens when light hits an object? • The reason we see an object is because the object can do the following with light: • Reflection • Absorption • A bit of both

4. Reflection Reflection is the process in which light ‘bounces off’ a surface and changes direction How would you use a ray diagram to illustrate this?

5. Absorption E Absorption is the process in which light energy remains in an object and is converted into heat Objects appear the colour they are because they absorb all colours of the spectrum except the one our eyes see (it is reflected) The black ‘E’ below appears black because it absorbs all of the light that hits it (no light hits your eyes)

6. Absorption/Reflection

7. Transmission • Transmission is the process in which light travels through an object and continues travelling • Different objects transmit different amounts of light • There are 3 ways to describe transmission: • Transparent • Translucent • Opaque

8. Transparent If light is transmitted directly through an object without any change in direction, the object is transparent What is an example of a transparent object?

9. Translucent If light can penetrate an object but it is scattered in many directions, the object is translucent What is an example of a translucent object?

10. Opaque If an object absorbs or reflects light only and no light penetrates it, the object is opaque What is an example of an opaque object?

11. Transparent/Translucent/Opaque Opaque Transparent Translucent