1. Luminous and non-luminous
What does transparent, translucent and opaque mean?
Say what each thing means
Explain, with reasons, uses for each of them
Give examples of each

2. What does TRANSPARENT mean?
When light shines on a transparent material, such as glass in a window, it passes through it and so objects on the other side of it can be seen clearly

3. What does TRANSLUCENT mean?
When light shines on a translucent object, such as tracing paper, some of the light passes through but many light rays are scattered.

4. What does OPAQUE mean?
When light shines on an opaque object none of the light passes through it.

5. Learning Outcomes
Recall what ‘luminous’ and ‘non-luminous’ means Describe the structure of the eye Classify different non-luminous objects as being translucent, transparent and opaque

6. The Human Eye
Watch the video on the human eye! Draw and label a diagram of the human eye!
The Structure of the Human Eye (3:32 mins)

7. How the eye works
optic nerve – carries information from the eye to the brain
retina – where the focused light is detected
ciliary muscle – where light enters the eye
lens – light is focused onto the retina
iris – controls the amount of light entering the eye
cornea – focuses the light and protects the eye

8. What do the words LUMINOUS and NON-LUMINOUS mean?
An object that gives out its own light e.g. The Sun
NON-LUMINOUS
An object that cannot give out its own light e.g. a chair, human, apple

9. How do we see things?
An object that gives out light is described as luminous. How does light from a luminous object such as a light bulb reach the eye?
Light travels in a straight line directly into the eye.
An object that does not give out light is non-luminous. How does your eye see a non-luminous object such as a comb?
Light hits the comb and some of it is reflected into the eye.

10. You decide!!

11. REACHES / LAMP / LIGHT / LESS / BLOCKED / LUMINOUS / SUN
Shadows
Complete the following paragraph: To see we need _____. Light comes from light sources. We call these sources ________ . A light source could be a ______ or the ____. Light travels ____ the source until it _______ an object. When light travelling from a source is _______ a shadow is ____. A shadow is an area of ____ light.
REACHES / LAMP / LIGHT / LESS / BLOCKED / LUMINOUS / SUN
MADE / FROM