Elements of Seeing ( mura namag bio atay)

Question 1

The ___________ of a human is composed of the eye, optic nerve, and certain parts of the brain.

Answer 1

visual system

Question 2

The _______ is the organ that allows a human to ______ light and produces electrical ______ that will be sent through the optic nerve to the brain.

Answer 2

eye, sense, impulses

Question 3

The ________ is that part of the visual system where impulses are ____________.

Answer 3

brain, processed

Question 4

Rays of light pass through the transparent _________ of the eye and through an opening called the ____________.

Answer 4

cornea, pupil

Question 5

The ______ surrounds the pupil and adjusts for the amount of light available. It ______ and _________ to control the __________ of light the interior of the eye receives.

Answer 5

iris, opens, closes, quantity

Question 6

The ________ is a transaprent ellipsoidal medium that changes ___________, allowing it to ________ and _____________ the rays of light entering the interior of the eye.

Answer 6

lens, thickness, bend and focus,

Question 7

The lens concentrates the rays of light on the ______________, a membrance on the back of the eye.

Answer 7

retina

Question 8

LENS

thickens: ________
narrows: _____________

Answer 8

nearby
distant

Question 9

The ___________ is composed of nerve cells with _____________ that are shaped like ________ and ___________.

Answer 9

retina, photoreceptors, cones, rods

Question 10

The photoreceptors that are shaped like _________ provide color vision and respond best to ________ light.

Answer 10

cones, bright

Question 11

There are three types of cone-shaped photorecepors in the retina, each of the type responds to one ___________ colors of light. which are ______,____,___.

Answer 11

primary, green, blue, red.

Question 12

About __% of the population, mostly males, has defective color vision.

Answer 12

5%

Question 13

It is the inability to distinguish colors. commonly _________ and _________.

Answer 13

color blindess, red, green

Question 14

People who are completely red-green colorblind tend to see red and greens as __________.

Answer 14

yellow

Question 15

Light is a form of energy known as ___________________.

Answer 15

electromagnetic radiation

Question 16

Light travels as an ______________.

Answer 16

electromagnetic wave

Question 17

Unlike sound, light travels through __________ of space - unlike sound.

Answer 17

vacuum

Question 18

Ligh travels for __________ km/s.

Answer 18

300,000

Question 19

It is an energy radiated in the form of a wave caused by an electric field interacting with a _____________.

Answer 19

Electromagnetic Radiation, magnetic field

Question 20

It results in the acceleration of charged particles

Answer 20

Electromagnetic Radiation

Question 21

Electromagnetic radiation is categorized by _____________ and ____________.

Answer 21

wavelength , frequency

Question 22

meassures as a distance from one peak of one wave to the next wave.

Answer 22

wavelength

Question 23

wavelength is expressed in ________ or _____________

Answer 23

meters, nanometers ( 1 nm is 000 001 meter or one billionth of a meter)

Question 24

Frequency is the number of waves per second expressed in units of ________.

Answer 24

hertz

Question 25

Most light sources emit electromagnetic radiation composed of different ___________ of light. UV - ____% Visible light - ____% infrared radiation- ____ %

Answer 25

wavelengths 5 45 50

Question 26

It is a part of electromagnetic spectrum and capable of exciting the retina and ultimately producing visual sensation

Answer 26

Visible light

Question 27

It is the wavelengths of electromagnetic radiation to which the human eye is sensitive

Answer 27

visible light

Question 28

When light strikes a surface, the surface is ___________.

Answer 28

illuminated

Question 29

It is the amount of light incedent on ( striking) of a surface.

Answer 29

Illuminance

Question 30

It is how bright an object appears

Answer 30

Luminance

Question 31

The eyes sees_________ as the light leaving the object, but the eye cannot see it without ________________ reflecting off the object in the direction of the ____________.

Answer 31

luminance, visible light, viewer

Question 32

It is the ratio of the reflected light versus the light striking the surface.

Answer 32

Reflectance

Question 33

It is the ratio of light transmitted through body to light illuminating surface. A _______ body transmits light without distorting the image.

Answer 33

Transmittance, transparent

Question 34

It is the ratio of the light absorbed versus the light striking the surface.

Answer 34

Absorptance