Term
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Definition
| The process by which a ray (of light) re-bounds from a boundary between two different media.
The angle of incidence always equals the angle of reflection. The reflected image is always laterally inverted.
[image] |
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Term
| What is the Law of reflection? |
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Definition
| The Law of reflection states that the angle of incidence equals the angle of reflection. The incident ray and the reflected ray and the normal are all in the same plane. [image] |
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Term
| What properties does a reflected image have? |
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Definition
| The reflected image is always laterally inverted. It is the same size as the object It is the same way up as the object (erect) It is as far behind the reflecting surface as the object is in front. It is virtual. [image] |
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Term
| What is angle of incidence? |
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Definition
| The angle of incidence is the angle between the normal and the incident ray. [image] |
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Term
| What is angle of reflection? |
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Definition
| The angle of reflection is the angle between the normal and the reflected ray. [image] |
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Term
| Draw a diagram to show reflection of a point on an object in a plane mirror. |
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Definition
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Term
| How is a boundary between two optical media drawn in a ray diagram? |
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Definition
| A boundary is drawn between media of different optical density (air/glass, air/water etc.)
In a diagram a boundary is represented by a solid line - always drawn with a ruler and sharp pencil!
A boundary is shaded at the back with chevrons if it is reflective (i.e. if light rays will reflect off it) [image]
[image] |
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Term
| How is a ray of light represented in a ray diagram? |
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Definition
| A ray is represented by a solid line. It always has an arrow on it to show which way it is going. (No arrow and it is a boundary line!) [image] |
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Term
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Definition
| A normal is the line you draw perpendicular to the boundary (at right angles to it). It is drawn so that you can measure angles from it. This is sometimes drawn as a solid line with a 'right angle symbol' put between it and the boundary OR as a dashed line - again the symbol showing it is perpendicular to the bounday must be included. [image] |
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Term
| How are all angles in ray diagrams measured? |
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Definition
| Angles are always measured from the normal to the ray. [image] |
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