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11 Cards in this Set
- Front
- Back
What is the normal? |
A line drawn at right angles to the boundary between the two media. |
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What are some of the differences between the object and the image? |
Object: real, can touch
Image: upright, laterally inverted (left becomes right, right becomes left) |
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What does the law of reflection state? |
i = r
Angle of incidence (i) must ALWAYS be equal to angle of reflection (r) |
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Define refraction of light |
It is the change of direction of a light ray when it crosses a boundary between two transparent substances. |
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Why does light split up into different colours when it passes through a triangular prism? |
In a prism, the light has to pass through two surfaces that are NOT PARALLEL. Therefore every colour emerging from the prism is travelling in a different direction. |
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Finish the sentence
If the speed is reduced...? |
Refraction is towards the normal. |
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Finish the sentence
If the speed is increased...? |
Refraction is away from the normal. |
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What happens to the waves when they are exactly in line with the normal? |
The direction does not change. |
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Define diffraction |
The spreading out of waves as they pass through a gap or round the edge of an obstacle. |
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The amount of diffraction depends on the size of the gap compared to the size of the wave.
What happens when a wave goes through a:
b) Narrow gap? |
a) Diffraction still happens but not as much.
b) Diffraction happens, and the effects are more significant. |
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Why might people living in hilly areas have poor radio reception? |
Hills act as an obstacle for radio waves.
Diffraction takes place and the waves spread outward.
As a result, the houses in the valleys behind the hills have poor radio reception. |