WorksheetsPre-Assessment: Light
Total questions: 25
Worksheet time: 8mins
A student placed a pencil in a cup of water. The pencil appears broken because light-
light travelling from water to air bends away from the normal making the pencil under water look closer to the surface
light travelling from water to air bends towards the normal making the pencil under water look further away
light travelling from air to water bends towards the normal making the pencil under water look higher up
light travelling from air to water bends away from the normal making the pencil under water look closer to the surface
In comparison to air glass has _____________ index of refraction.
the same
a higher
a lower
an unknown
Refraction occurs due to _____________
the change in the wave's speed when it enters a new medium
the wave bouncing off a boundary
the change in the wave's frequency when it enters a new medium
the wave bending around a barrier
The refractive index of a medium is the ratio of the speed of light in a vacuum to the speed of light in that medium
True
False
The law of reflection states that
the angle of reflection is equal to the angle of incidence
the angle of reflection is greater than the angle of incidence
the image is laterally inverted
the image must be upright and the same size as the object
Does this object give off its own light?
yes
no
Does this object give off its own light?
yes
no
Does this object give off its own light?
yes
no
Can you see objects in the dark?
yes
no
Which of these provides the best explanation for why the pencil appears broken?
The pencil absorbs the light rays that hit it.
Water reflects light rays away from the pencil.
Light rays are bent by the water in the glass.
The surface of the water reflects the light rays.
Caleb is sitting near the window on a sunny day. When he closes the curtain, the room becomes darker. What property of the curtain allows it to make the room darker?
The curtain absorbs light.
The curtain is brightly colored.
The curtain folds easily.
The curtain is rectangular shape.
Light travels in straight lines until reflected by another object. Which illustration best shows the light being reflected?
Which of the following is the best example of an object transmitting light?
A black sweater in the sun.
A clean window in the sun.
A curved mirror in the sun.
A long shadow in the sun.
