Light

Question 1

____ - A self-propagating TRANSVERSE wave that consists of mutually supporting electric and magnetic fields (also known as electromagnetic radiation)

Answer 1

Light

Question 2

Since light is self-propagating, it can travel in a _____

Answer 2

Vacuum

Question 3

____ ____ travel at approximately 3 x 10^8 m/s in a VACUUM

Answer 3

Light waves

Question 4

Instead of v we use _ in the speed of light. So c = f(wavelength)

Answer 4

c

Question 5

The wavelength of a light wave is usually measured in _____

Answer 5

Nanometers (nm)

Question 6

_ nanometer = 1x10^-9 meters

Answer 6

1 nanometer (Ex: 500 meters x 1x10^-9)

Question 7

When light waves travel from one medium to another the speed ____ but the frequency ___

Answer 7

Changes
Stays the same

Question 8

Since c = f(wavelength) and this means that wavelength also ____

Answer 8

Changes

Question 9

Light moves on its own so as density increases, the speed of light ____

Answer 9

Decreases

Question 10

Light waves travel faster through __ than ___ and ___

Answer 10

Air
Than liquids and solids

Question 11

In the EM spectrum all light waves travel at the ___ speed but the light wavelength, frequency, and energy vary

Answer 11

Same

Question 12

Purple light has the ____ frequency and ___ wavelength

Answer 12

Highest frequency
Shortest wavelength

Question 13

Red has the ___ frequency and the ___ wavelength

Answer 13

Lowest frequency
Longest wavelength

Question 14

The wavelengths of ____ ___ range is 400-700 nm

Answer 14

Visible light range

Question 15

Gamma rays have the ____ wavelength

Answer 15

Shortest wavelength

Question 16

Radio waves have the _____ wavelength

Answer 16

Longest wavelength

Question 17

____ - The slight bending of light as it passes an edge of an obstacle or an aperture (slit or small opening. Size depends on how much the light bends)

Answer 17

Diffraction

Question 18

The smaller the size of the slit, the ____ light bends

Answer 18

Less

Question 19

The larger the size of the slit is the __ the light bends

Answer 19

More

Question 20

The ____ slit provides two coherent monochromatic sources that produce an interference pattern of light and dark bands or spots

Answer 20

Double slit

Question 21

The more slits, the ____ spots in between the light

Answer 21

More

Question 22

Light is ____ if it hits a surface and bounces off rather than being transmitted through

Answer 22

Reflected

Question 23

____ (____) reflection- reflection off a smooth surface. (Sun reflecting off water as itself)

Answer 23

Plane (Spectacular) Reflection

Question 24

____ reflection - Reflection of light into many directions by rough surfaces. (Sun reflecting off water with many ripples. Goes in many different directions)

Answer 24

Diffuse reflection

Question 25

___ __ ____ - States the angle of incidence is equal to the angle of reflection

Answer 25

Law of reflection

Question 26

in ALL optics problems the angles are measured from the ___, - A perpendicular line from the surface at the point of incidence (contact)

Answer 26

Normal

Question 27

___ - The bending of light as it travels from one medium to the next

Answer 27

Refraction

Question 28

The way in which light ___ when it enters a new medium is not only material dependent, but also frequency dependent

Answer 28

Refracts

Question 29

____ frequencies refract more, this means violet light bends more than red light

Answer 29

Higher frequency

Question 30

____ - The spreading out of light according to color (Ex: The prism)

Answer 30

Dispersion

Question 31

___ light is refracted predominantly at 42.5 degrees. (The light reaching your eye comes from higher drops in the sky)

Answer 31

Red

Question 32

____ light is refracted predominantly at 40.8 degrees. (The light reaching your eye comes from lower drops in the sky)

Answer 32

Violet

Question 33

___ light is the combination of all colors of the visible light spectrum

Answer 33

White light

Question 34

The three primary colors of light are

Answer 34

Red, Green, and blue

Question 35

____ - A material which selectively absorbs certain wavelengths of light and then reflects other wavelengths. (Primary colors are yellow, cyan, and magenta. They make black)

Answer 35

Pigment

Question 36

Light is ____ and pigments are ___ in terms of color

Answer 36

Additive Subtractive

Question 37

Red filter causes it to ___ all colors but red

Answer 37

Absorb

Question 38

____ light vibrates in every direction

Answer 38

Natural light

Question 39

____ light vibrates in one specific plane

Answer 39

Polarized light

Question 40

We can ___ light by using a filter with small slits that filter light polarized in other dimensions

Answer 40

Polarize

Question 41

Polarization reduces ____

Answer 41

Glare

Question 42

_____ - The ability to see through something clearly

Answer 42

Transparent

Question 43

____ - The ability to partially see through a material

Answer 43

Translucent

Question 44

____ - Not being able to see through a material

Answer 44

Opaque

Question 45

light changes ___ it changes media. This change in ___ causes light to change its direction

Answer 45

Speed

Question 46

___ ____ ____ (n)- The ratio of the speed of light in a vacuum compared to the speed of light in the medium

Answer 46

Index of refraction (n)

Question 47

_ = speed of light in vacuum 3x10^8m/s

Answer 47

c

Question 48

_ = speed of light in new medium (m/s)

Answer 48

v

Question 49

Since the speed of light slows down in media besides vacuum, “n” will always be ___ than or equal to 1

Answer 49

Greater than

Question 50

We will approximate the “n” of air to be _

Answer 50

1

Question 51

___ ___ - An equation that relates the angle of the incidence of light and the angle of refraction of light at the interface of two different mediums

Answer 51

Snell’s law

Question 52

When light travels into a medium with a __ index of refraction, it bends TOWARDS the normal

Answer 52

higher

Question 53

When light travels into a ____ index of refraction, it bends AWAY from the normal

Answer 53

Lower

Question 54

If nr > ni the refracted ray is bending ___ the normal

Answer 54

Toward

Question 55

If ni > nr the refracted ray is bending ___ from the normal

Answer 55

AWAY

Question 56

If you cross a vertical (up and down) polarizing lens with a horizontal (left and right) polarizing lens what happens to the light through both lenses?

Answer 56

No light penetrates through both lenses

Question 57

What 3 color cones do we have in our eyes

Answer 57

Red green blue

Question 58

What wave properties are involved in the double slit experiment?

Answer 58

Diffraction and interference

Question 59

Two complementary colors of light (Red and cyan) are mixed together to give which color light?

Answer 59

White

Question 60

EXAMPLE OF HAVING ONLY 1 DEGREE

Answer 60

nair sin 35 = nwater sin 02 1.00029 sin 35 = 1.33 sin 02 Solve the first sin Divide both sides by 1.33 0.4314 = sin 02 sin ^-1 (press shift button to get negative sin) (0.4314) = 02 02 = 25.6 degrees