optics

Question 1

Law of Reflection (convex)

Answer 1

convex mirrors cause reflected rays to diverge

Question 2

Law of reflection (concave)

Answer 2

reflected rays converge to a central points

Question 3

SALT

Answer 3

smaller
attitude
location
type

Question 4

Sources of light, how they’re produced, examples

Answer 4

Incandescence – very high temperatures. ex. candle, lightbulb

Electrical discharge – an electric current is passed through a gas. ex. glass lights, lightning

Fluorescence – UV light is converted to visible light immediately. ex. fluorescent lightbulb

Phosphorescence – absorption of UV light followed by emission of visible light over a period of time. ex. glow in the dark

Chemiluminescence – chemical reaction. ex. glowing bracelets

Bioluminescence – chemical reaction in a living organism. ex. glow bugs

Triboluminescent – from the friction of scratching crystals. ex. life savers, crystals

Light emitting diodes – electric current passes through a semi conductor. ex. indicator light, christmas light.

Question 5

Incandescence

Answer 5

very high temperatures. ex. candle, lightbulb

Question 6

Electrical Discharge

Answer 6

an electric current is passed through a gas. ex. glass lights, lightning

Question 7

Fluorescence

Answer 7

UV light is converted to visible light immediately. ex. fluorescence lightbulb

Question 8

Phosphorescence

Answer 8

absorption of UV light followed by emission of visible light over a period of time. ex. glow in the dark

Question 9

Chemiluminescence

Answer 9

chemical reaction. ex. glowing bracelets

Question 10

Bioluminescence

Answer 10

chemical reaction in a living organism. ex. glow bugs

Question 11

Triboluminescence

Answer 11

from the friction of scratching crystals. ex. life savers, crystals

Question 12

Light emitting diodes

Answer 12

electric current passes through a semi conductor. ex. indicator light, christmas light.

Question 13

Properties of light

Answer 13

light travels faster than any known entity

light travels in waves

light travels in straight lines

light energy is transferred through radiation

Question 14

Speed of light

Answer 14

3X10^8

Question 15

Types of electromagnetic radiation, from longer to shorter wavelength

Answer 15

radio
microwave 
infrared 
ultraviolet 
xray
gamma ray

Question 16

Opaque, translucent and transparent examples

Answer 16

Opaque - human body, cardboard
Translucent - sunglasses, tinted windows
Transparent - air, pure water

Question 17

Laser lights characteristics

Answer 17

Monochromaticity - laser light is only a single color, it splits when in a prism because wave lengths are slowed down

Divergence - Laser lights do not spread out or diverge

Coherence - Laser lights have coherent waves

Question 18

Why does light refract

Answer 18

it refracts when it travels at an angle with a different refractive index. the change in direction is because of a change in speed.

Question 19

What is a critical angle.

What is the point where it is reflected.

Answer 19

An angle of incidence is no longer refracted but reflected.

Greater than 90