Chapter 15 Light and Optics - Part II

Question 1

cone cells

Answer 1

cells in the eye’s retina that detect electromagnetic radiation (wavelengths of light).

Question 2

a mixture of the entire rainbow of visible wavelengths

Answer 2

the color white

Question 3

hue

Answer 3

what we call the basic color of light (red, blue, yellow, etc)

Question 4

another name for the primary hues of light

Answer 4

additive primary colors

Question 5

what’s unique about cyan?

Answer 5

It doesn’t have a wavelength on the visible spectrum; it is a color only perceived by the brain (a combo of green and blue).

Question 6

pigments

Answer 6

pigments have colors that can be mixed (such as paint and light filters). [Subtractive primary colors are cyan,magenta,yellow.]

Question 7

subtractive primary colors

Answer 7

a mixture of two additive primary colors (red,blue or green).

Question 8

name for the intensity of a color

Answer 8

saturation

Question 9

name for the lightness or darkness of a color

Answer 9

value

Question 10

name for the basic “color” of a color

Answer 10

hue

Question 11

nonluminous

Answer 11

things that do not produce their own light

Question 12

law of reflection

Answer 12

the angle of the incident ray equals the angle of the reflected ray (measured at the point of incidence)

Question 13

diffuse reflection

Answer 13

uneven surfaces that reflect light waves in all directions (preventing you from seeing an image of the light source in that material)

Question 14

diffuse reflection

Answer 14

uneven surfaces that reflect light waves in all directions (“no use” trying to see an image of the light source in that material)

Question 15

specular reflection

Answer 15

smooth, polished surfaces that reflect light rays in generally the same direction (forming a “spectacular”image of the light source).

Question 16

materials producing “glassy specular reflection”

Answer 16

glass and water, because only some light rays are reflected at the surface, (others are reflected deeper in in the interior, pass through, or are absorbed).

Question 17

incident ray

Answer 17

the light ray approaching a reflective surface

Question 18

reflected ray

Answer 18

the outgoing ray from a reflective surface

Question 19

virtual image

Answer 19

seen in a position where no real object exists (e.g., behind the plane of the mirror)

Question 20

real image

Answer 20

can be projected, unlike a virtual image.

Question 21

reflection vs refraction

Answer 21

reflection is the change in the direction of a wave. refraction is the change in the speed of a wave.

Question 22

lens

Answer 22

a disk of optically clear material that refracts light to produce a real or virtual image.