Physics test #2

Question 1

refraction

Answer 1

the bending of light at the boundary of 2 transparent materials

Question 2

medium/media

Answer 2

material through which light travels through

Question 3

incident ray

Answer 3

ray of light that travels to the boundary between 2 medias

Question 4

refracted ray

Answer 4

light that travels in a new direction through the medium

Question 5

normal

Answer 5

dashed line perpendicular to the boundary where incident ray hits

Question 6

angle of incident

Answer 6

angle between incident ray and normal

Question 7

angle of refraction

Answer 7

angle between refracted ray and normal

Question 8

critical angle

Answer 8

the angle of incident where refracted ray is 90

Question 9

total internal reflection

Answer 9

when light is refracted inside the medium instead of being refracted as it exist

Question 10

partial reflection/refraction

Answer 10

when some light is reflected inside the medium and some light is refracted as it exist

Question 11

index of refraction

Answer 11

number which indicates how much speed decrease

Question 12

lens

Answer 12

curved transparent material that refracts light

Question 13

concave lens

Answer 13

two inward curving face; thinner in the middle, thicker on the edges

Question 14

convex lens

Answer 14

two outward curving faces; thicker in the middle, thinner on the edges

Question 15

axis of symmetry

Answer 15

divides lens in half vertically

Question 16

principle axis

Answer 16

divides lens in half horizontally

Question 17

optical center

Answer 17

centre of lens; point where axis of symmetry meets PA

Question 18

focal point

Answer 18

point on PA where converges or diverges

Question 19

focal length

Answer 19

distance between optical centre and F

Question 20

what does it mean when refracted ray is bent towards normal

Answer 20

• light is slowing down
• going into a more dense material
• angle of incident > angle of refraction

Question 21

what does it mean when light is bent away from normal

Answer 21

• light is speeding up
• going into a less dense material
• angle of incident < angle of refraction

Question 22

in the formula n = c/v what does it stand for

Answer 22

n = index of refraction
c = light in a vacuum
v = light in a medium

Question 23

in the formula for n = sin<i/sin<r what does it stand for

Answer 23

n = incidex of refraction
sin<iv = incident angle in vacuum
sin<rm = refracted angle in medium

Question 24

Qualitative image characteristics in concave lenses

Answer 24

S - smaller
A - inverted laterally
L - same side as lens, closer
T - virtual ray

Question 25

Qualitative image characteristics in convex lenses

Answer 25

s - smaller, larger, same a - inverted vertically l - same or opposite side, closer, further, same distance t - real or virtual or none

Question 26

in snells law n,sinI = n2sinR

Answer 26

n = index of refraction in medium 1 n2 = index of refraction in medium 2 SinI = incident angle in medium 1 Sinr2 = refracted angle in medium 2

Question 27

what does everything repersent in this equation 1/f = 1/do + 1/di

Answer 27

f = focal length do = distance of object di = distance of image

Question 28

what are the sign convections of 1/f = 1/do + 1/di

Answer 28

do - is always positive di - is positive if the image in on the opposite side (real) and is negative if the image is on the same side (virtual) f - postive in convex negative in concave

Question 29

who is Ibn Al-Haytham

Answer 29

first scientist to study the boundary between air and acrylic block

Question 30

who is Jean Foucault

Answer 30

first scientist of measure speed of light in water

Question 31

who is Willebroad Snell

Answer 31

discovered a relationship between angle of incident and angle of refraction and index of refraction for 2 media

Question 32

who is hans Lipperhey

Answer 32

he created the first telescope

Question 33

which lens is converging

Answer 33

convex

Question 34

which is a diverging lens

Answer 34

concave

Question 35

apparent depth

Answer 35

optical phenomena where objects seem closer to the surface

Question 36

telescope

Answer 36

an optical device that uses a lens to magnify a distant object