Light Waves

Question 1

Frequency

Answer 1

number of occurrences per unit time.

Question 2

Cones

Answer 2

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.

Question 3

Rods

Answer 3

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.

Question 4

Real image

Answer 4

optical image at which rays from object converge

Question 5

Virtual image

Answer 5

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

Question 6

Retina

Answer 6

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.

Question 7

Lens

Answer 7

optical device designed to converge or diverge light.

Question 8

Cornea

Answer 8

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).

Question 9

Curvature

Answer 9

two surfaces of a lens can be convex (outward

Question 10

Concave lens

Answer 10

lens thinner in center than edges; a diverging lens.

Question 11

Convex lens

Answer 11

lens that is thicker in the center than at edges.

Question 12

Converge

Answer 12

Come from different spots and meet at one spot

Question 13

Diverge

Answer 13

Begin at same point, and separate into separate points

Question 14

Focal length

Answer 14

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

Question 15

Focal point

Answer 15

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

Question 16

Myopia

Answer 16

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

Question 17

Hyperopia

Answer 17

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

Question 18

Wavelength

Answer 18

distance between corresponding points on two successive waves.