Light, Color, Optics, Camera Review

Question 1

Three primary colors of light?

Answer 1

Red, blue, green

Question 2

Red+blue=
Red + Green=
Blue + Green=

Answer 2

Magenta
Yellow
Cyan

Question 3

What are cyan, magenta and yellow?

Answer 3

The secondary colors of light

Question 4

3 complimentary color combinations?

Answer 4

Red + cyan
Blue + yellow
Green + magenta

Question 5

White light is shined on a wall, shadow is cyan, what color is getting blocked?

Answer 5

Red

Question 6

Two kinds of light

Answer 6

Vertical and horizontal

Question 7

identify the parts of the eye and their functions

Question 8

Orientation of the image at the back of our eye? Real or virtual?

Answer 8

An inverted real image

Question 9

3 types of eye disorders, causes, corrections

Answer 9

Myopia:
Eyeball is too long
Diverging lenses

Hyperopia:
Eyeball is too short.
Converging lenses

Astigmatism:
Uneven cornea
Lenses that even out the surface, torque lenses

Question 10

The law of reflection

Answer 10

The angle of reflection equals the angle of incidence.

Question 11

What is good and bad about using a convex mirror on the passenger side of a car? And concave make-up or shaving mirror?

Answer 11

Convex mirrors help you see a wider area, the downside is that distances are distorted. Concave mirrors magnify close up things, the downside is distances are distorted.

Question 12

What is the difference between diffuse and smooth reflection?

Answer 12

Smooth reflection, where light comes in parallel, leaves parallel. Diffuse comes in parallel, leaves haphazard.

Question 13

What type of wave is light?

Answer 13

An electromagnetic wave.

Question 14

Electromagnetic spectrum waves from lowest to highest frequency

Answer 14

Radio, microwave, infrared, visible, ultraviolet, x-ray, gamma ray.

Question 15

speed of light?

Answer 15

3x10 to the power of 8 m/s

Question 16

three types of materials of light transmitting?

Answer 16

Transparent (lets most light through), Translucent (lets some light through), Opaque (lets almost none through)

Question 17

3 important characteristics of pinhole

Answer 17

Small, circular shape and smooth edge.

Question 18

What is the focal length of a pinhole camera, ie. what is it equal to?

Answer 18

From the pinhole to the film.

Question 19

Focal length increases, magnification?

Answer 19

Increases

Question 20

Focal length increases, brightness?

Answer 20

Decreases

Question 21

4 examples of photosensitivity

Answer 21

Plant photosynthesis, tanning, sunburn and fading of dyes

Question 22

Refraction?

Answer 22

The change in direction of a wave when it enters a new material because it appears to slow down.

Question 23

Light travels the slower in

Answer 23

Denser materials

Question 24

Where is the moon for lunar/solar eclipses

Question 25

If yellow light is shined on a wall and the shadow is red then what color is NOT getting blocked?

Answer 25

Red is not getting blocked. (Whatever the color of the shadow is is not getting blocked)

Question 26

What does polarization have to do with these two kinds of light?

Answer 26

By polarizing one kind of light, you block it.

Question 27

What is required in order to trick our brain into seeing a movie in 3D?

Answer 27

A slightly different image to each eye.

Question 28

11. How does polarization make 3D movies possible?

Answer 28

2 versions of the film are polarized oppositely on top of each other, and one lens blocks one version for each eye.

Question 29

Explain in steps what happens to light that enters the eye.

Answer 29

• Light enters the cornea, that does 2/3 of focusing
• Light is focused into pupil
• Light goes through lens that focuses it into retina, traveling through vitreous humor
• Retina transforms into an electrical signal
  -The optic nerve sends the signal to the brain

Question 30

Why did the glass rod seems to disappear in the oil

Answer 30

The index of refraction of oil and glass are almost identical.