Lenses Flashcards
The type of lens that is thicker in the middle that it is on the edges.
Convex
A concave lens causes light rays to ________.
Converge
The type of lens that is thinner in the middle than it is on the edges.
Concave
Which lens could be used to start a fire?
Convex because it can focus light rays to one point.
Light travels in ________ beams that lenses can focus.
Parallel
The thickest part of a concave lens.
Edges
The thickest part of a convex lens
Middle
The distance from the lens to the focal point is called the _____ ______.
Focal length
One unit that the focal length can be measured in.
Centimetres
An important use of a lens is to create one of these.
Image
Another word for upside down.
Inverted
An enlarged image is also called a _________ image.
Magnified
A convex lens causes light rays to ________.
Converge
A concave lens is causes light rays to _______.
Diverge
The focus of a concave lens is on the ____ side that the light rays have come from.
Same
The focus of a convex lens is on the ________ side that the light rays have come from.
Opposite
All lenses must be ___________ for light to pass through them.
Transparent
