A ________ lens is thinner in the middle than at the ends.
Concave
A _________ lens is thicker in the middle than at the ends.
Concave
Wearing glasses with __________ lenses would help a person who can't see objects near clearly.
Concave
Wearing glasses with ___________ lenses would help a person who can't see objects far away clearly.
Convex
Give one example of an optical instrument.
Give one example of an optical instrument.
Give one example of an optical instrument.
A green pen reflects __________ light.
Green
A red pen reflects __________ light.
Red
A yellow pen absorbs _________ light.
All colors but yellow.
A white pen reflects _______ light.
All colors
A black pen reflects _________ light.
No color
Unlike charges ___________.
repel
absorb
attract
nothing
Like charges ____________.
nothing
absorb
repel
attract
Lightning is a form of ________________.
static electricity
Most magnets have large amounts of ______________.
iron
