| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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The eye consists of an: iris; pupil; cornea; lens; retina; and optic nerve. |
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What are the components of the eye? |
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Light enters the eye through the pupil. |
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How does light enter the eye? |
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The pupil changes size to keep the amount of light energy entering the eye constant. |
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Why does the pupil change size? In pairs one cover an eye for 15s then uncover so partner can see pupil shrink.
https://www.youtube.com/watch?v=DW2iwEshWME |
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Light is refracted so that rays of light from the one place on the object reaches only one place on the retina. This creates a focused (clear) and bright image. |
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How is a focused (clear) and bright image produced by the eye? |
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The cornea and the lens are convex in shape and so focus the light. |
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Why are the cornea and lens convex in shape? |
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A lens can collect the rays that enter it and concentrate them to a single point on the screen, forming a bright, focused image. |
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What does a lens do to the image of an object? |
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The retina has specialised cells that sense / detect light energy by having chemicals that are destroyed when they absorb the light energy. |
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How do they specialised cells detect changes in light energy in the eye? Look at a bright light and then close eyes to 'see' coloured shapes. |
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| D |
The cell uses the amount of chemical left to send a message to the brain in the form of electrical energy. |
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How does the eye inform the brain what you see? |
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