What role does light play in the process of photosynthesis?

Light provides the energy that plants use to convert carbon dioxide and water into glucose during photosynthesis.

The sun, stars, and glow-worms are examples of ___ sources of light.

Natural

What is the primary way we are able to see objects around us?

We see objects because light from a source reflects off these objects and enters our eyes.

True or False: Artificial sources of light include natural phenomena like the sun and stars.

False. Artificial sources of light include items like candles and electric bulbs.

Light is a form of energy that enables us to see, and without it, the world would be completely ___.

Dark

What is the phenomenon called when light travels in straight lines?

The phenomenon is known as rectilinear propagation of light.

Fill in the blank: When sunlight passes through raindrops, it separates into ___ colors.

Seven

True or False: Light can travel through bent tubes to reach our eyes.

False. Light cannot travel through bent tubes; it travels in straight lines.

What colors make up the spectrum of white light as observed in a rainbow?

The colors are violet, indigo, blue, green, yellow, orange, and red.

Describe how light spreads from its source.

Light spreads in all directions from its source unless obstructed by a barrier.

Materials that allow almost all light to pass through them are called ___ materials.

Transparent

True or False: Opaque materials allow some light to pass through but not enough to see through clearly.

False. Opaque materials do not allow any light to pass through.

Translucent materials allow ___ light to pass through, but not enough to see clearly.

Some

Give two examples of transparent materials.

Air and pure water.

Opaque materials do not allow light to pass through. Name one example of an opaque material.

Wood