Seeing colour - Shadow + understanding UV, IR and radiation

13 important questions on Seeing colour - Shadow + understanding UV, IR and radiation

What is diffuse light?

The light from the air comes from all directions.

What is a partial shadow?

A shadow that is lit by light from another light source

What is a full shadow?

A full shadow arises at places where no light at all falls.
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What is a divergent light beam?

A divergent light beam is one where the light rays spread out.

Explain why fluorescent tubes produce few shadows on the table top.

Fluorescent tubes are are and emit many diverging light beams that overlap each other. This means that almost no shadows are made.

What does a high-lying sun cause?

there is almost no shadow.

How can you calculate N (the magnification factor)

divide the distance from the lamp by the distance from the puppet

Where does infrared radiation lay in the electromagnetic spectrum?

to the left of the visible red light

How can objects that are warmer than their surroundings be seen?

using an infrared (thermal imaging) camera.

Which types of rays are dangerous to the body?

X-rays and gamma rays

Where through can X-rays travel?

though soft skin but they are stopped by the bones

Where through can gamma rays travel?

almost everything, only thick concrete walls, a lead plate or other thick, heavy material will stop gamma rays.

Why are gamma rays and x-rays dangerous?

because the can damage a cell and a damaged cell can turn into a cancerous cell.

The question on the page originate from the summary of the following study material:

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