Light
What is a translucent material?
Materials that allow some light to pass through.
What is an opaque object?
Materials that do not allow light to pass through.
What is transparent material?
Materials that allow light to pass through.
What is the luminance intensity of a candle?
A candle is low.
The light that is emitted from the surface of an object such as a light or a candle; also known as brightness.
What is illuminance/luminance intensity?
What is the umbra?
The fully shaded region of a shadow.
Diagram used to represent how light travels.
ray diagram
Component of the universe that travels at the fastest speed.
light
What is the luminance intensity of the sun?
The sun is very high.
Objects that do not give off light but may reflect it.
non-luminous
Area of reduced light created whenever an opaque object blocks the path of light
shadow
Objects that give off light.
luminous
How long does it take for light from the sun to reach the earth?
About 8 minutes.
How does light travel?
In straight lines.
A directed straight line that represents the path followed by the light.
A ray
The partially shaded region of a shadow, formed by some light passing an opaque object.
the penumbra
What happens to a shadow when the object is close to a light source?
The shadow is really big and blurry.
How long does it take for light from the nearest star to reach earth?
About 4 years.
Light bounces off this in the earths atmosphere?
particles or dust
Earth is a _____________ object.
Non-luminous
How fast does light travel?
About 300 000 km/s
What happens to a shadow when an object is far from the light source?
Its small and very clear.
Optical lens thin at the centre and thick along the edges
Concave lens
Position of object when lens forms magnified and erect image? Type of lens?
Convex when object is between F and O