optics & its branches, nature characteristics and propagation of light

Question 1

the study of light as rays

Answer 1

Geometrical optics

Question 2

also known as ray optics

Answer 2

Geometrical Optics

Question 3

it deals with the formation of images by light rays acted on by lenses, prisms and mirrors

Answer 3

Geometrical Optics

Question 4

it treats light as a collection of rays that travel in straight line

Answer 4

Geometrical optics

Question 5

Study of light as waves

Answer 5

Physical Optics

Question 6

also known as wave optics

Answer 6

Physical optics

Question 7

it deals with diffraction, interference and polarization

Answer 7

Physical Optics

Question 8

the study of light as particles

Answer 8

Quantum optics

Question 9

it deals with the interaction of light and matter

Answer 9

Quantum optics

Question 10

also known as photon optics

Answer 10

Quantum optics

Question 11

it is the emission or transformation of energy in the form of waves or particles through space or through an optical medium

Answer 11

RADIATION

Question 12

these are objects or bodies which generate their own light

Answer 12

Luminous objects or bodies

Question 13

• He measured the speed of light when he and an assistant carrying each lamp, stood on a different hilltops with a known distance between them.
• With his pulse as a timer concluded that the speed of light was too fast to be measured by this method

Answer 13

Galileo

Question 14

He predicted that the speed of light is finite by observing the Jupiter’s nearest moon

Answer 14

Ole Christensen Rømer

Question 15

the first man to measure the speed of light through land experiment known as toothed wheel experiment

Answer 15

Armand Hippolyte Louis Fizeau

Question 16

he measured the speed of light in a laboratory using a light source, a rapidly rotating mirror and a stationary mirror.

Answer 16

Jean Foucault

Question 17

This light is found between the visible and x-ray spectrums

Answer 17

Ultraviolet

Question 18

wavelength of UV-A

Answer 18

400 - 315 nm

Question 19

wavelength of UV-B

Answer 19

315 - 280 nm

Question 20

wavelength of UV-C

Answer 20

280 - 100 nm

Question 21

what does HEV stands for?

Answer 21

High energy Visible light

Question 22

wavelength of HEV

Answer 22

380 - 530 nm

Question 23

is a high-frequency, high-energy light in the visible spectrum, which has a number of biological effects, including those on the eye.

Answer 23

High Energy Visible Light

Question 24

it is an electromagnetic radiation with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye

Answer 24

Infrared

Question 25

Light of single wavelength

Answer 25

monochromatic

Question 26

the splitting of white light into its component colors

Answer 26

Dispersion

Question 27

visible light that is refracted the most

Answer 27

Violet

Question 28

visible light that is refracted the least

Answer 28

Red

Question 29

LASER stands for?

Answer 29

**_L_**_ight_ **_A_**_mplification_ by the **_S_**_timulated_ **_E_**_mission_ of **_R_**_adiation_

Question 30

LED stands for?

Answer 30

Light Emitting Diode

Question 31

White light or Laser Light? Polychromatic

Answer 31

White light

Question 32

White light or Laser Light? not collimated

Answer 32

White light

Question 33

White light or Laser Light? multi directional

Answer 33

White light

Question 34

White light or Laser Light? monochromatic

Answer 34

LASER

Question 35

White light or Laser Light? collimated

Answer 35

LASER

Question 36

White light or Laser Light? Unidirectional

Answer 36

LASER

Question 37

The more polished the material is, the greater the \_\_\_\_\_\_.

Answer 37

Reflection

Question 38

The conversion of light energy into heat

Answer 38

Absorption

Question 39

it will occur to majority of light if series of lenses will be placed in front of a patient's eye

Answer 39

Refraction

Question 40

said that “Visible objects are sources of light”

Answer 40

Phytagoras

Question 41

said that “the eye is the source of light”

Answer 41

Empedocles (fifth century BC)

Question 42

the downward motion of wave

Answer 42

Trough

Question 43

the distance from the equilibrium position

Answer 43

Displacement

Question 44

the maximum displacement of the vibration of the wave

Answer 44

Amplitude

Question 45

the distance traveled by light as it goes through one complete vibration

Answer 45

Wavelength

Question 46

the completion of a regular periodic event of a wave

Answer 46

Cycle

Question 47

the number of complete waves generated by the source in one second

Answer 47

Frequency

Question 48

the time required by the particle in the medium to complete one cycle of one vibration

Answer 48

Period

Question 49

the rate or speed at which the wave travels in a give period of time

Answer 49

Velocity

Question 50

the unit of frequency

Answer 50

Hertz

Question 51

Constructive interference produces a \_\_\_\_\_.

Answer 51

SUPER TROUGH

Question 52

The interference of a crest with a trough produces _______ interference.

Answer 52

Destructive

Question 53

cancellation of reflection in ***ophthalmic lenses*** is due to ______ interference.

Answer 53

Destructive

Question 54

colors produced by ***anti-reflective coatings of lenses*** is due to _____ interference.

Answer 54

destructive

Question 55

Standing waves can produce ____ of waves.

Answer 55

Interference

Question 56

he proved the wave nature of light with a double slit diffraction experiment

Answer 56

THOMAS YOUNG

Question 57

Light rays which spread apart as if originating from a point source

Answer 57

Divergent light rays

Question 58

Light rays coming from near objects are \_\_\_\_\_.

Answer 58

Divergent light rays

Question 59

Collection of divergent, convergent or parallel pencil arising from an extended source

Answer 59

BEAM

Question 60

the general term in which the convergence or divergence of light may be expressed

Answer 60

VERGENCE

Question 61

Parallel pencils have _____ vergence.

Answer 61

ZERO

Question 62

A pencil of light with positive vergence

Answer 62

Convergent Pencil

Question 63

Optical _____ is considered 20 feet or greater.

Answer 63

INFINITY

Question 64

* is a disturbance that travels in a hypothetical medium called ether.

Answer 64

WAVE

Question 65

* wave whose particles of the medium vibrate at right angle to the direction in which the wave travels

Answer 65

TRANSVERSE WAVE

Question 66

* are transverse waves in which the direction of vibration is at right angles to the direction of propagation.

Answer 66

WAVE MOTION

Question 67

* Longest wavelength EM waves * Uses: * TV broadcasting * AM and FM broadcast radio * Heart rate monitors * Cell phone communication

Answer 67

RADIO WAVES

Question 68

* Wavelengths from 1 mm- 1 m * Uses: * Bluetooth headsets * Broadband Wireless Internet * Radar * GPS

Answer 68

MICROWAVE

Question 69

* Wavelengths in between microwaves and visible light * Uses: * Night vision goggles * Remote controls * Heat-seeking missiles

Answer 69

INFRARED

Question 70

* Shorter wavelengths than visible light * Uses: * Black lights * Sterilizing medical equipment * Water disinfection * Security images on moneyA

Answer 70

ULTRAVIOLET

Question 71

* Extremely low risk for DNA damage * Can destroy Vitamin A in skin

Answer 71

UV A

Question 72

* Can cause DNA damage, leading to skin cancer * Responsible for sunburn

Answer 72

UV B & UV C

Question 73

* Tiny wavelength, high energy waves * Uses: * Medical imaging * Airport security * Inspecting industrial welds

Answer 73

X-RAYS

Question 74

* Smallest wavelengths, highest energy EM waves * Uses * Food irradiation * Cancer treatment * Treating wood flooring

Answer 74

GAMMA RAYS