Light

Question 1

Speed of light

Answer 1

3x10 8

Question 2

What type of wave is light?

Answer 2

Transverse

Question 3

Law of reflection is

Answer 3

I=r

Question 4

What is refraction?

Answer 4

When the wave direction changes due to speed changes across a boundary

Question 5

What happens if the light is entering a more dense medium

Answer 5

Bends TO normal

Question 6

What happens if the light is entering a less dense medium ?

Answer 6

Bends AWAY from normal

Question 7

Refractive index equation

Answer 7

n= sin(i)/sin(r)

Question 8

What is snells law?

Answer 8

Sin(i) dp to sin(r)

Question 9

What is total internal reflection?

Answer 9

When no light leaves the material due to the angle of incidence being bigger than the critical angle

Question 10

What happens when I>C

Answer 10

Total internal reflection

Question 11

Uses of TIR

Answer 11

Endoscopes, optical fibres (for communications and keyhole surgery)

Question 12

What is the critical angle equation

Answer 12

C=sin-1(1/n)

Question 13

What is the critical angle?

Answer 13

When the light refracts 90° when it’s equal to angle of incidence

Question 14

What is a converging lens?

Answer 14

Brings rays together

Question 15

Uses of converging lens

Answer 15

Magnifying glass and correcting long sightedness

Question 16

Diverging lens

Answer 16

Spreads rays out

Question 17

Use of diverging lens

Answer 17

Corrects short sightedness

Question 18

What’s a virtual image?

Answer 18

Can’t be projected onto a screen

Question 19

What is the spectrum of white light?

Answer 19

Red, orange, yellow, green, blue, indigo and violet

Question 20

What’s red lights characteristic?

Answer 20

Low frequency and long wavelength

Question 21

What’s violets characteristic?

Answer 21

High frequency and short wavelength

Question 22

What colour bends most from normal through a triangular prism?

Answer 22

Violet

Question 23

What is monochromatic light

Answer 23

A light made from waves with all the same frequency so of the SAME colour

Question 24

What’s the symbol for a diverging lens?

Answer 24

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Question 25

What’s symbol of converging lens?

Answer 25

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