light and optics quiz 2

Question 1

what is refraction

Answer 1

the bending or change of direction when light travels from one medium into another

Question 2

index of reflection symbol

Answer 2

n

Question 3

speed of light in a medium

Answer 3

v

Question 4

equation of speed of light in a vacuum

Answer 4

3.0 x 10/8 m/s

Question 5

Critical angle

Answer 5

the angle of incidence that results in an angle of refraction of 90 degrees

Question 6

Total internal reflection

Answer 6

when the angle of incidence is greater that the critical angle

Question 7

what 2 conditions must be meet before total internal refection can be occur

Answer 7

1. light travels slower in the first medium than the second
2. angle of incidence is large enough that no refection occurs in the medium, the ray is reflected back into the first medium instead

Question 8

biconvex (converging) lens

Answer 8

the ovel shape, light rays converge

Question 9

biconcave (diverging)

Answer 9

vase shape- light rays spreed apart

Question 10

F’

Answer 10

secondary primary focus

Question 11

beyond 2F’ (biconvex - converging)

Answer 11

s: smaller
a: inverted
l: between f &2f
t: real

Question 12

At F’ (biconvex - converging)

Answer 12

s: same size
a: invented
l: at 2F
t: real

Question 13

Between 2F’ and F’ (biconvex - converging)

Answer 13

s: larger
a: inverted
l: Beyond F
t: real

Question 14

At F’(biconvex - converging)

Answer 14

NO IMAGE

Question 15

Inside F’ (biconvex - converging)

Answer 15

s: much larger
a: up-right
l: same side lens as object
t: virtual

Question 16

in diverging lens, in image is always….

Answer 16

s: smaller
a: upright
l: same side lens as object
t: virtural

Question 17

Accommodation

Answer 17

the change of shape of the eye lens by eye muscles to allow a sharply focused image o the retina

Question 18

Myopia

Answer 18

nearsighted (see close thing)
difficulty seeing FAR
image form in front of retina
corrected wit diverging lens

Question 19

Hyperopia

Answer 19

Farsighted
difficulty seeing NEAR things
images forms behind rentina
corrected with converging lens

Question 20

Presbyopia

Answer 20

a type of farsightedness caused by the loss of accommodation
occurs as a person ages

Question 21

photoreciptor cells

Answer 21

rod & cone cells

Question 22

rod cells

Answer 22

sensitive to light - used to see black and white

cannot provide a clear image due to the large amount of the cells

Question 23

cone cells

Answer 23

allow seeing colour - not sensitive - work weel in bright conditions
fewer cells to see detailed colour

Question 24

diaphragm (camera vs human eye)

Answer 24

Iris

- controls amount of light entering

Question 25

Aperture (camera vs human eye)

Answer 25

• pupil

- where light enters the camaera

Question 26

Film/ digital sensor (camera vs human eye)

Answer 26

• retina

- where images is focused

Question 27

Camera lens (camera vs human eye)

Answer 27

• lens & cornea

- cause light rays to converge

Question 28

optical nerve

Answer 28

connects eye to brain to allow brain to flip image

Question 29

what is happenings when speed of light in the second medium is less than the first medium

Answer 29

light bends towards the normal

Question 30

what happens when the speed of light in the second medium is grater than the first medium.

Answer 30

light bends away from the normal