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Light 1
The moon is NOT luminous. A luminous object gives out light. The moon reflects light from the sun.

Light 1

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The sun is a huge source of light. The most common light sources are thermal: a body at a given temperature emits a characteristic spectrum of black-body radiation. Examples are sunlight, incandescent light bulbs and glowing solid particles in flames.

1 .
We can see objects because .......
Our eyes give out light
They bend light into our eyes
They reflect light into our eyes
They shine light into our eyes
2 .
Light travels .......
Fastest in a vacuum
Fastest in air
Fastest in water
Slower than sound
Light travels at almost 300,000,000 meters per second in a vacuum
3 .
Light travels in .......
Circular lines
Straight lines
Wavy lines
Zig zag lines
4 .
We usually look at our reflection in a flat mirror. This type of mirror is a .......
Bi-concave mirror
Concave mirror
Convex mirror
Plane mirror
Concave and convex mirrors are curved
5 .
Which of the following is NOT luminous?
A burning candle
A car headlight (switched on)
The moon
The sun
A luminous object gives out light
6 .
Light can travel through .......
A luminous material
A mirror
A translucent material
An opaque material
Light can travel through translucent material
7 .
Which of the following is translucent?
A mirror
Air
Greaseproof paper
The moon
Translucent means allowing light to pass through but diffusing it so that people and objects on the opposite side are not clearly visible. A frosted window is translucent but not transparent. Tracing paper is another example of a translucent material
8 .
Objects with a smooth surface give .......
Diffuse reflection
Irregular reflection
No reflection
Regular reflection
Rough surfaces give diffuse reflection
9 .
In a flat mirror, the angle of incidence is equal to .......
The angle of emergence
The angle of reflection
The angle of refraction
The angle of transmission
10 .
In a ray diagram, a normal is a line drawn at .......
180° to the mirror's surface
45° to the mirror's surface
60° to the mirror's surface
90° to the mirror's surface
Author:  Sue Davison

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