properties of light and mirrors

Question 1

when light bounces off a surface

Answer 1

reflection

Question 2

reflection off a smooth, shiny surface (reflected rays are parallel)

Answer 2

spéculer reflection

Question 3

reflection off an IRREGULAR, rough, or dull surface (makes the rays scatter in different directions)

Answer 3

diffuse reflection (aluminum paper)

Question 4

ray diagram

Answer 4

shows how a single ray bounces off a smooth surface

Question 5

incident ray

Answer 5

incoming ray that travels from a light source toward a surface

Question 6

line perpendicular to the surface where a ray of light meets the surface

Answer 6

normal

Question 7

reflected ray

Answer 7

bounces off the surface, begins at a point where incident and normal meet

Question 8

angle of incidence (0i)

Answer 8

angle between incident and normal

Question 9

angle of reflection (0r)

Answer 9

angle between reflected and normal

Question 10

laws of reflection

Answer 10

1. angle of incidence = angle of reflection

2. incident ray, reflected ray, normal all lie in same plane

Question 11

four characteristics of salt

Answer 11

size, attitude, location, type

Question 12

virtual image

Answer 12

image where light doesn’t arrive from image location

Question 13

real image

Answer 13

image can be seen in a screen bc light rays are actually converging at location

Question 14

plane mirror characteristics

Answer 14

same, then virtual

Question 15

center of curvature (C)

Answer 15

centre of sphere where all normals from mirror surface meet

Question 16

principal axis PA

Answer 16

like passing thru centre of curvature and is normal to centre of mirror

Question 17

focal point F

Answer 17

point where light rays parallel to PA converge when reflected off concave mirror

Question 18

vertex V

Answer 18

PA meets mirror

Question 19

focal length f

Answer 19

distance from vertex to focal point

Question 20

searchlight mirror

Answer 20

filament at focal point, reflected rays form parallel beam of light

Question 21

makeup mirror

Answer 21

concave forms larger upright virtual image. face goes between focal point mirror

Question 22

dentists mirror

Answer 22

concave surface focuses light into mouth. larger upright virtual image

Question 23

side view mirror

Answer 23

larger field of view, smaller upright image

Question 24

safety/security mirror

Answer 24

larger view