Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
|
What is the normal? |
A line drawn at right angles to the boundary between the two media. |
|
|
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) |
|
|
What does the law of reflection state? |
i = r
Angle of incidence (i) must ALWAYS be equal to angle of reflection (r) |
|
|
Define refraction of light |
It is the change of direction of a light ray when it crosses a boundary between two transparent substances. |
|
|
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. |
|
|
Finish the sentence
If the speed is reduced...? |
Refraction is towards the normal. |
|
|
Finish the sentence
If the speed is increased...? |
Refraction is away from the normal. |
|
|
What happens to the waves when they are exactly in line with the normal? |
The direction does not change. |
|
|
Define diffraction |
The spreading out of waves as they pass through a gap or round the edge of an obstacle. |
|
|
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. |
|
|
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. |
