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Flashcards in Options Deck (16):
0

define radioactive index:

the ratio of the speed of light in a vacuum to the speed of light in the medium

1

blue light has an index of refraction that is ________ than red light

larger

2

focal point:

the point on the principal axis of the lens through which a ray parallel to the principal axis goes after refraction in the lens

3

why is the sky blue?

blue light is scattered in all directions as a result of interaction with small dust particles in the atmosphere.

4

virtual image

images created when rays of light seem to come from a single point byt in fact they do not pass through that point.

5

real image

the rays of light do actually pass thorugh a single point

6

converging lens

brings parallel rays into one focus point

7

focal length

the distance between the centre of the lens and the focal point

8

linear magnification

the ratio between the size of theimage and the size of the object. image over object

9

power of a lens

1/F (Focal length)

10

lens equaiton

1/u + 1/v =1/f
u=object distancce
v= imaage distance

11

sperical averration

the fact that raus striking the outer regions of a shperical lens will be brought to a slightly different focus point from those striking hte inner regions of the same lens alter affect: change the shape of the lens, decrease the aperture.

12

chromatic aperbation

the fact that rays of different colours will be brought to a slightly different focus point by the same lens. effect can be eliminated by an achromatic doublet (compund lens)

13

path difference

p= n wavelength

14

path difference (Geometry)

p = d sin ø

15

defraction grating

a series of parallel slits