Light Scatterind

Question 1

Scattering of light is caused due to the ____________ in a medium

Answer 1

In-homogeneities

Question 2

Defuse diffraction

Answer 2

Air and medium with high index

Question 3

What are the two types of scattering?

Answer 3

Incoherent

Coherent

Question 4

Conditions for incoherent scattering

Answer 4

White light

Particles far apart

Question 5

Incoherent scattering depends on

Answer 5

Size of particles
Distance between particles
Strength of interaction

Question 6

What determines the strength of the interaction in incoherent light scattering?

Answer 6

Refractive index and absoprtion strength

Question 7

When the scattering particles are smaller than the wavelength

Answer 7

Rayleigh scattering

Question 8

What does rayleigh scattering profile show?

Answer 8

Forward and backward scatter (scatter in all directions)

Question 9

Rayleigh has a strong _________ dependence

Answer 9

Wavelength

Question 10

What kind of wavelength scatters more in rayleigh scattering?

Answer 10

Shorter, blue

Question 11

Rayleigh scattering is an ____________, as the scattered photons energy do not change.

Answer 11

Elastic scattering

Question 12

Light going to a denser medium changes the _______

Answer 12

Wavelength

Question 13

For rayleigh scattering, the intensity of the scattering blue light it _______ times than that of the scattered red light

Answer 13

3.3

Question 14

How do you calculate relative scattering intensity?

Answer 14

(Lambda1/lamda2)^4

Question 15

How much brighter is LED than sodium light?

Answer 15

3x

Question 16

The bluer the light, the more the light scatters and the larger the area of the ______

Answer 16

Glare

Question 17

Downside of LED?

Answer 17

Affects astronomical observations, and causes harmful effects on he wild plants, and animal population (light pollution)

Question 18

Photopic sensitivity

Answer 18

Day time sensitivity, when rods are sensitive

Question 19

What does blue light disrupt?

Answer 19

Circadian rhythm, disrupts melatonin

Question 20

Mesopic vision

Answer 20

Dawn/dusk

Rods and cones become active

Question 21

Scotopic sensitivity

Answer 21

Peak sensitivity at about 500nm

Question 22

When the scattering particles are larger than the wavelength of light

Answer 22

Mie scattering

Question 23

What are the dominant causes of mie scattering?

Answer 23

Geometrical optics process of reflection and refraction are the dominant causes of the mie scattering

Question 24

Scattering profile of mie scattering

Answer 24

Stronger forward scattering

Question 25

Mie scattering theory applies for particles to both ________ and _______

Answer 25

Absorb and scatter, rayleigh is only scatter

Question 26

Techniques based on mie scattering theory are used in several studies in the understanding of

Answer 26

Optical properties of biological tissues like skin, brain, bone, other soft tissues, other fibrous tissues and fatty tissues, and even blood cells

Question 27

What are some examples of Rayleigh’s scattering

Answer 27

Bluish smoke from fire and cigarette

Question 28

Why does cigarette smoke appear blue but when its exhaled, becomes white?

Answer 28

Its Rayleigh scattering first, then when it is inhaled, it mixes with the moisture particles and becomes mie scattering

Question 29

The more the light is scattered, the less the wavelength dependence of the ________

Answer 29

Scattered intensity