Reflection and Light

Question 0

What are the rules for drawing Concave Ray diagrams

Answer 0

Ray going through C reflects on itself, Ray parallel to PA reflects through F, Ray through F reflects parallel to PA

Question 1

What are the types of curved reflectors

Answer 1

Concave/Converging, Convex/Diverging

Question 2

What are the characteristics of images in a concave mirror

Answer 2

Beyond C- s, inv., bet. C+F, r; At C- same, inv., at C, r; Betw. C+F- l, inv., bey. C, r; At F- no image; Within F- l, up, b mirror, v

Question 3

What are the rules for drawing convex Ray diagrams

Answer 3

Same as concave but appearing to go through points

Question 4

What are the characteristics of images in a convex mirror

Answer 4

Smaller, upright, behind the mirror, virtual

Question 5

Solar collector

Answer 5

Sun’s parallel rays directed to food at F

Question 6

Satellite Dish

Answer 6

Parallel radio waves reflect off dish to the receiver at F

Question 7

Flashlight/Headlight

Answer 7

Light positioned at F will cause Rays to produce parallel beam

Question 8

Makeup Mirror

Answer 8

Face positioned between F and mirror produces larger upright image

Question 9

Security/Side Mirror

Answer 9

Can see wide angles and smaller images are produced

Question 10

What is light

Answer 10

A wave of electric and magnetic fields

Question 11

What are the two types of light sources

Answer 11

Luminous: an object that gives off its own light and Non-Luminous: an object that doesn’t give off its own light

Question 12

Incandescence

Answer 12

Light given off due to high temperature

Question 13

Fluorescence

Answer 13

Chemical that gives off light when hit by invisible high energy light waves

Question 14

Phosphorescence

Answer 14

Chemical that gives off light when hit by high energy light waves that stays luminous for long

Question 15

Chemiluminescence

Answer 15

Chemical reactions that give off light with next to no heat

Question 16

Bioluminescence

Answer 16

When living things produce light

Question 17

Triboluminescence

Answer 17

When certain crystals (sugar) are scratched, crushed or rubbed producing light

Question 18

LED: Light Emitting Diodes

Answer 18

Small lights that don’t get too hot when giving off light made of small crystals which light up with electricity.

Question 19

Why are LEDs better than other light sources

Answer 19

They don’t waste energy as heat, they don’t use Mercury, they last long

Question 20

What are LASERS

Answer 20

Light Amplification by Stimulated Emission of Radiation, the light is very intense, the same colour, and stays together as a beam

Question 21

What is specular reflection

Answer 21

Regular reflection, on shiny surfaces light reflects following law of reflection

Question 22

What is diffuse reflection

Answer 22

On rough surfaces the reflection of waves becomes irregular. Light tends to spread out in all directions and no clear image is formed.

Question 23

What are the characteristics of an image

Answer 23

Size- L/s, Attitude- up/inverted, Location- b/i, Type- r/v