Equations unit 7

Question 1

Speed of light

Answer 1

3e8 m/s

Question 2

Red light

Answer 2

500-700nm

Question 3

Green light

Answer 3

450-630nm

Question 4

Blue light

Answer 4

400-500nm

Question 5

Sky blue principle thing

Answer 5

Rayleigh scattering - light scatters due to the presence of molecules. More molecules = bigger wavelength and vice versa.

Question 6

Redshift

Answer 6

happens when the light source is moving away from the observer (bigger wavelength)

Question 7

Blueshift

Answer 7

happens when the light source is moving towards the observer (smaller wavelength)

Question 8

Index of refraction

Answer 8

i of refraction = light speed in medium / 3e8 m/s

Question 9

Snell’s law

Answer 9

index of refraction for first medium * sin(angle of incidence) = index of refraction for second medium * sin(angle of refraction)

Question 10

Total internal reflection

Answer 10

Angle of refraction reaches critical and so light go bounce bounce

Question 11

Snell’s law (in terms of speed)

Answer 11

v1/v2 = sin(angle of incidence) / sin(angle of refraction)

Question 12

Diffraction

Answer 12

If light passes through slits, it bends like sound does
High points (constructive interference): maxima
Low points (destructive interference): minima

Question 13

Equation for double-slit interference

Answer 13

distance(sin(theta)) = wavelength * m

Question 14

Lens/mirror equation

Answer 14

1/f = 1/do + 1/di

Question 15

Distance of image / object

Answer 15

di = 1 / ((1/f) - (1/do))

Question 16

Focal length

Answer 16

(di * do) / (do + di)

Question 17

Height

Answer 17

-ho(di / do)

Question 18

Radius

Answer 18

2f

Question 19

Power

Answer 19

1/f