4.3

Question 1

luminous

Answer 1

an object that releases or emits light

Question 2

non-luminous

Answer 2

objects that do not produce their own light

Question 3

reflection

Answer 3

light bounces off an object and then into your eyes

Question 4

incident ray

Answer 4

incoming ray

Question 5

reflected ray

Answer 5

ray that bounces off the mirror

Question 6

normal

Answer 6

dotted imaginary line

Question 7

plane mirrors

Answer 7

flat mirrors

Question 8

lateral inversion

Answer 8

when the right side appears left in a mirror and vice versa

Question 9

virtual image

Answer 9

the object projected inside a mirror

Question 10

refraction

Answer 10

bending of light

Question 11

refractive index

Answer 11

measure of how easily light travels through a substance

Question 12

critical angle

Answer 12

light refracted so far from normal runs along the boundary of 2 substances

Question 13

total internal reflection

Answer 13

light reflected from boundary as though its a mirror

Question 14

convex mirror

Answer 14

lens that bulge outwards (magnifies)

Question 15

concave mirror

Answer 15

lens that curves inwards

Question 16

total internal reflection

Answer 16

light reflected from the air glass boundary as if its a mirror