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Light can past through only the object is __________
transparent
`__________ are used to make eyeglasses, projectors and binocuars
Convex lens
What is the man using?
a periscope
We can see the bent pencil due to _________
an optical illusion
A _________ lens makes things look bigger.
convex
A material such as water, glass or air is ____________.
medium
A __________ is a transparent substance with at least one curved surface.
lens
An _________ is something our eyes see but which is not real.
optical illusion
__________ is the bending of light.
Refraction
Light always travels in __________
a straight line
People can use ___________ to see over the heads of the people standing in front of them
Periscope
The angles that each ray makes with the normal are the same.
 
True
 
False
The _________ line is a line draw at right angles.
normal
The arriving ray of light is called ________
 
incident ray
 
reflected ray
 
refracted ray
All plane mirrors are flat mirrors
 
True
 
False
Light can't travel in the space.
 
False
 
True
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