Light and Optical Systems Test

Light travels in _____ lines from its source.

• Wavy

• Straight

• Zig-zag

• Curved

What must occur to make vision possible? Choose the best answer.

• A light from a source must bounce off your eyes and then reach an object.

• There must be a path for the light to strike your eyes.

• There must be a direct path for the light to strike your eyes.

• A light from a source must bounce off an object and then to your eyes in wavy lines.

A light year is a measure of _______.

• Weight

• Distance

• Length

• Width

A light year is ____________.

• The length of a beam of light that has travelled in space over a period of one year.

• The distance travelled by light in space over a period of 2 years.

• The distance travelled by light in space over a period of 2 weeks.

• The distance travelled by light in space over a period of one year.

True or False: People have only used light since the 2000s.

• True

• False

_____ and _____ were used in China and Ancient Greece.

• Lenses

• Glass

• Magnifying glass

• Mirrors

Archimedes developed a plan to use mirrors and focus light to ______

• Burn his enemy's hair

• Burn enemy camps

• Burn enemy ships

Pythagoras thought light consisted of ______. These beams came from a ________ in straight lines, and the sense of sight occured when these beams ________ the objects person was looking at.

• Beams, person's eyes, touched

• Beams, light source, bounced off

• Particles, a person's eyes, touched

The Greek scientist Euclid discovered that when you shine a beam of light onto a flat mirror, what happens?

• The light is absorbed into the opaque surface.

• The sense of sight occurrs when these beams touched the objects person was looking at.

• The light bounces off in straight, parallel beams

• The angle between the incoming beam and the mirror is equal to the angle between the reflected beam and the mirror

What was Euclid's discovery called?

• The Law of Light

• The Law of Refraction

• The Law of Reflection

• The Law of Euclid