Optics

Question 1

Light bouncing off a surface:

Answer 1

Reflection

Question 2

Glowing filament of a light bulb is an example of

Answer 2

Incandescence

Question 3

Primary colours of light:

Answer 3

Red, green, blue

Question 4

Red light and blue light are mixed:

Answer 4

Magenta or purple

Question 5

Green light and blue light are mixed:

Answer 5

Cyan light

Question 6

Red and green light:

Answer 6

Yellow light

Question 7

Translucent:

Answer 7

Some light passed through

Question 8

Transparent

Answer 8

All light passes through (clear)

Question 9

Can light travel through a vaccum?

Answer 9

Yes

Question 10

Speed of light in a vacuum

Answer 10

300 000 km/s

Question 11

Electromagnetic spectrum

Answer 11

Radio > microwave > infrared > (VISIBLE) > uv > x-Ray > gamma rays

Question 12

Bioluminescence

Answer 12

The production of light by living things

Question 13

Incandescent:

Answer 13

Lights that use a heated and electrical filament to produce light

Question 14

Fluorescent:

Answer 14

Low pressure , tubed, gas charged lights

Question 15

Chemiluminescence

Answer 15

Chemical reactions that produce lights

Question 16

White light:

Answer 16

Mixture of all given colored that haven’t been dispersed

Question 17

Why would someone’s shirt appear red ?

Answer 17

Because it absorbs all the other colours a

Question 18

Law of reflection :

Answer 18

Incident angle = reflected angle

Question 19

Refraction:

Answer 19

The light changing direction due to entering a different medium

Question 20

If light travels to a denser medium it

Answer 20

Slows down and moves toward he medium

Question 21

If light enters a less dense medium

Answer 21

It speeds up and moves away from the normal

Question 22

Critical angle:

Answer 22

The angle at which light creates total internal reflection & the refracted Ray falls along the boundary

Question 23

An object would have to be placed where if you wanted a virtual image reflected in a concave mirror?

Answer 23

In front of the focal point

Question 24

Concave mirrors create an image..

Answer 24

Concave mirrors form a virtual image that is larger than the actual object

Question 25

Visible light is the only form of electromagnetic radiation that:

Answer 25

Can be detected by the human eye

Question 26

Incandescence can only occur when:

Answer 26

The filament gets very hot

Question 27

Why does white light separate when it exits a prism:

Answer 27

Different wave lengths go at different speeds and change direction (refraction). This is dispersion.,

Question 28

Which colour is more dispersed?

Answer 28

Blue bc the wavelengths are shorter and more scattered