Light and Optics Quiz

The model shows a special glass fiber that is thinner than some metal wires. When light enters one end of the fiber, it moves through the fiber as shown. After the light leaves the fiber, it travels -

• in a straight line

• back into the fiber

• around the fiber

• in a curve

For a class demonstration a student turned off the lights in the classroom. The student then shined light from a flashlight through a hole in a piece of cardboard. The class saw the narrow beam of light continue until another student placed a mirror in the light's path. The light did not continue past the mirror because –

• light cannot travel very far.

• the mirror absorbed all the light.

• the light was refracted back to the light source.

• light travels in a straight line and cannot go around objects

In 1859, Henry Bursill published a book of hand shadows. The picture below shows one of these hand shadows. Which property of light makes it possible to produce hand shadows?

• Light can be refracted.

• Light is a form of energy.

• Light travels in straight lines.

• Light can be separated into different colors.

A teacher takes the top and a side off a box. She cuts a hole in another side and puts a candle outside the box, as shown below. When the teacher lights the candle in a dark room, some of the candlelight shines through the hole. Which diagram best shows how the light appears on the opposite wall of the box?

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A student is looking directly at a lit night light through two different cardboard tubes as shown.

Through which tube, if any, will the light be seen and why?

• The bent tube only because the light bounces off the sides of the tube and travels through the tube to the student’s eye.

• The straight tube only because the light travels in a straight line directly to the student’s eye.

• Both tubes because light travels equally well along straight and curved paths.

• Neither tube because both tubes absorb all of the light.