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20 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is light? |
Its an electromagnetic radiation |
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Which objects emit light? |
Luminous |
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What are non-luminous objects? |
Objects that don't emit light |
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How can we see non-liminous objects? |
They can be seen if they are reflectimg light from a luminous source |
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What are light rays? |
a thin beam of light that travels in a straight line |
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Classify non-liminous objects |
a) transparent b) translucent c) opaque |
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What is a transparent material? |
A material that light passes through it and objects on the other side can be seen clearly |
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What's a translucent material? |
A material that allows light to pass through them, but objects on the other side can't be seen clearly |
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What are opaque material |
A material that doesn't allow light through them |
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What is a shadow? |
Its a region without light, behind the object |
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How is a the size of the shadow affected? |
a) the size of light source b) the distance between the light source and the object |
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What is an incident ray? |
Light ray moving towards a surface |
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What is a reflected ray? |
Light ray leaving a surface |
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What's normal? |
Its a line perpendicular at 90° to a surface |
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What does the way the light is reflected depends on? |
Whether the surface is smooth or rough |
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How is the light ray reflected on a smooth surface? |
The angle of reflection is equal to the angle of incidence |
i=r |
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What are the two types of images |
a) virtual images b) real images |
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What is a real image? |
This is one through which the light rays actually pass and which can be formed on a screen |
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What is a virtual image? |
This is one through which the rays do not pass, they only appear to come from it |
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What happens if light is reflected in a rough rough surface? |
The rays are scattered in different directions |
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