Light & images

Question 0

4) What are the basic properties of light?

Answer 0

Light is energy
light travels in a straight line
Absorbed
Reflected 
Refracted 
Transmitted
Acts as a wave
300000km/s

Question 1

1) What is light?

Answer 1

Energy packaged as photons travels at 300 000km/sec

Question 2

5) What 3 things can happen to light when it hits on object?

Answer 2

Absorbs (takes in)
Reflects (bounces off)
Refracted (bent)

Question 3

2) what kinds of energy can be transformed into light?

Answer 3

Chemical, electrical, nuclear, thermal

Question 4

7) what are the two types of reflection? Define

Answer 4

Diffuse: from a rough surface, doesn’t produce a clear image. Instead you see what’s on the surface
Specular: from a mirror like surface, produces a image of the surroundings

Question 5

8) how does diffuse reflection allow you to read ink on paper?

Answer 5

The black ink absorbs most of the incident light and doesn’t reflect back to your eye, white paper producing diffuse reflection and reflects the Rays in all directions

Question 6

9) what is the difference between real and virtual images?

Answer 6

Real: can be placed on a screen
Virtual: only be seen by looking through an optical device

Question 7

What is the darker part of a shadow called?

Answer 7

Umbra

Question 8

What is the lighter part of the shadow called?

Answer 8

Penumbra

Question 9

What are the various sources of light?

Answer 9

Phosphorescence 
Incandescence
Fluorescence 
Chemiluminescence 
Bioluminescence 
Electric discharge

Question 10

What are the various sources of light?

Answer 10

Phosphorescence
Incandescence
Fluorescence
Chemiluminescence