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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.
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
2.
Light travels in .......
Circular lines
Straight lines
Wavy lines
Zig zag lines
3.
Light can travel through .......
A luminous material
A mirror
A translucent material
An opaque material
Light can travel through translucent material
4.
Objects with a smooth surface give .......
Diffuse reflection
Irregular reflection
No reflection
Regular reflection
Rough surfaces give diffuse reflection
5.
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
6.
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
7.
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
8.
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
9.
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
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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