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Physics of the Human Body > Light Waves > Flashcards

Flashcards in Light Waves Deck (18)
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1

Frequency

number of occurrences per unit time.

2

Cones

One of the photoreceptors in the retina of the eye that is responsible for daylight and color vision they are densely concentrated in the fovea centralis, creating the area of greatest visual acuity. Also called cone, retinal cone.

3

Rods

Rod cells, or rods, are photoreceptor cells in the retina of the eye that can function in less intense light than the other type of visual photoreceptor, cone cells. Rods are concentrated at the outer edges of the retina and are used in peripheral vision.

4

Real image

optical image at which rays from object converge

5

Virtual image

point from which light rays appear to diverge without actually doing so.

6

Retina

The retina is the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain. There is a small area, called the macula, in the retina that contains special light-sensitive cells.

7

Lens

optical device designed to converge or diverge light.

8

Cornea

transparent part of the eye that covers the front portion of the eye. It covers the pupil (the opening at the center of the eye), iris (the colored part of the eye), and anterior chamber (the fluid-filled inside of the eye).

9

Curvature

two surfaces of a lens can be convex (outward

10

Concave lens

lens thinner in center than edges; a diverging lens.

11

Convex lens

lens that is thicker in the center than at edges.

12

Converge

Come from different spots and meet at one spot

13

Diverge

Begin at same point, and separate into separate points

14

Focal length

distance from the focal point to the center of a lens or vertex of a mirror.

15

Focal point

location at which rays parallel to the optical axis of an ideal mirror or lens converge to a point.

16

Myopia

defect of eye, commonly called nearsightedness, in which distant objects focus in front of the retina.

17

Hyperopia

Farsightedness, or hyperopia, as it is medically termed, is a vision condition in which distant objects are usually seen clearly, but close ones do not come into proper focus

18

Wavelength

distance between corresponding points on two successive waves.