Light And Shadows Study Guide

Question 1

What ways can I be safe when working with light?

Answer 1

• View the sun through a pinhole camera

- View light produced during welding through #14 welders glasses.

Question 2

Can you identify two sources of light? [emit/reflect]

Answer 2

Emit: sun, flashlight, firefly, light bulb, TV
Reflect: mirror, moon, shiny plastic, TV

Question 3

What are the two types of light?

Answer 3

1. Artificial (man-made)

2. Natural

Question 4

How do light beams travel?

Answer 4

Light travels in a straight line

Question 5

How is a shadow formed?

Answer 5

A shadow is a dark image or figure cast on the ground. It is created when an object blocks the path of light.

Question 6

What materials will or will not block light?

Answer 6

Block: Opaque
Will not block: Transparent
Translucent cast lighter shadows

Question 7

What is refraction? When does this happen?

Answer 7

Refraction is the bending of light. Light bends as it passes through from one medium to another.

Question 8

What is reflection?

Answer 8

Reflection is when light bounces back off a surface

Question 9

What makes a good reflector? Examples?

Answer 9

A smooth, shiny surface

Examples: mirrors, calm lake, polished metals

Question 10

What happens when white light enters a prism?

Answer 10

It bends (refracts) creating a spectrum of colours/ rainbow.

Question 11

What does ROY G BIV stand for?

Answer 11

It explains the colours in the rainbow. 
Red
Orange
Yellow
Green
Blue
Indigo
Violet

Question 12

What refracts white light?

Answer 12

• Prism
• Crystal
• Water droplet

Question 13

What is visible light made up of?

Answer 13

Waves

Question 14

What happens to shadows early or late in the day (when the sun is low in the sky).

Answer 14

Shadows get longer.

Question 15

The angle of the sun causes a shadow to change what?

Answer 15

It’s length.