physics quiz

Question 1

how does a rearview mirror work using both reflection and refraction

Answer 1

It uses reflection for the image and refraction to control brightness.

Question 2

hyperopia

Answer 2

far-sightedness
eyes cannot focus on nearby objects
eye to short
corrected by converging lens

Question 3

how does total internal reflection occur

Answer 3

light travels from a medium with slower speed to a medium with faster speed

Question 4

Distinguish between the types of light emissions

Answer 4

Sun: Nuclear fusion
Incandescence: Heat
Electric Discharge: Sparks
Phosphorescence: Glow
Fluorescence: Quick glow
LEDs: Electrons
Chemiluminescence: Chemicals
Bioluminescence: Life
Triboluminescence: Friction

Question 5

Concave mirror points

Answer 5

Beyond C: smaller, inverted, between C+F, Real
At C: Same Size, inverted, at c, real
between c+f: larher, inerted, beyond c, real
At f: No image
Before F: larger upright, behind the mirror, Virtual

Question 6

optical density (controls determines the direction of the refracted ray)

Answer 6

refers to a mediums transparency and its ability to decrease of increase the speed at which a wave travels

Question 7

what s partial reflection/refraction

Answer 7

some light that is travelling from one medium into another is reflected and some is refracted at the boundary between the mediums

Question 8

myopia

Answer 8

near-sightedness
eyes cannot focus on distant objects
eye to long
corrected by diverging lens

Question 9

Describe how light is emitted

Answer 9

Absorb, Excited, Release

Question 10

what happens when a light ray moves from a less optically dense medium to a more optically dense medium?

Answer 10

• speed of light decreases
• the light ray bend toward the normal
• there is a smaller angle of refraction

Question 11

applications of total internal reflection

Answer 11

binoculars
cables
optical fibres

Question 12

convex mirror points

Answer 12

In front of mirror: smaller, upright, behind the mirror, virtual

Question 13

what determines how much light is reflected and how much is refracted

Answer 13

1. angle of incidence
2. relative indices of refraction

Question 14

what is a critical angle

Answer 14

the angle of incidence produces an angle of refraction at 90*

Question 15

equation to determine angle of refraction

Answer 15

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

Question 16

total internal reflection

Answer 16

incident light is not refracted but its entirely reflected back from the boundary

Question 17

what does the index of refraction depend on gases

Answer 17

• temperature
  -pressure

Question 18

What is Fermat’s principle

Answer 18

Predicts the path that light will take after reflecting from a surface or passing through more than one medium.
Light always follows the path that will take the least amount of time.

Question 19

what happens to the speed of light when it passes from one medium to another and what effect does this have on the ray light

Answer 19

the speed changes and the wave bends (changes its path)

Question 20

what does the index of refraction depend on solids and liquids

Answer 20

• temperature
  -pressure (but to a lesser extent

Question 21

identify real life applications of convex mirrors

Answer 21

• mirrors in all vehicles
• sunglasses
• magnification glasses

Question 22

parts of the human eye

Answer 22

1. cornea
2. retina
3. macula
4. pupil
5. sclera
6. lens
7. ciliary muscles
8. optical nerve

Question 23

what is refraction

Answer 23

refraction is the bending the waves due to a change in speed as they travel between media

Question 24

when does total internal reflection occur

Answer 24

occurs when the angle of incidence produces an angle of refraction at 90*

Question 25

what happens when a light ray moves from a more optically dense medium to a less optically dense medium?

Answer 25

• speed of light increases
• the light ray bends away
• there is a larger smaller angle of refraction

Question 26

difference between a real and a virtual image

Answer 26

Real: reflection in front of the mirror
Virtual: Reflection behind the mirror