w2 AaD Vergence at Curved Surfaces

Question 1

virtual image

Answer 1

erect/ upright not able to be projected onto a screen

Question 2

real image

Answer 2

inverted/ upside down able to be projected onto a screen

Question 3

formulae for surface power of a curved spherical surface

Answer 3

F = (n’ - n)/r
power = F
n’ = ref ind of secondary medium
n = ref ind of primary medium
r = radius of curvature of surface

Question 4

what is r at a convex surface

Answer 4

positive

Question 5

what is r at a concave surface??

Answer 5

r is negative

Question 6

what happens to normals on a curved(spherical) surface??

Answer 6

there are many normals pointing out of hte centre of curvature so light bends differently depending on where it hits.

Question 7

why dont all light rays focus at one point of a spherical surface??

Answer 7

because they bend at different angles due to the curve, this is called spherical aberration

Question 8

what is spherical aberration?

Answer 8

it’s when light rays don’t focus at the same point because of the curved surface

Question 9

linear magnification equation:

Answer 9

shows the ratio of image height to object height
m = h’/h = L/L’
image height/ object height = object vergence/ image vergence

Question 10

what does it mean if the magnification m is positive??

Answer 10

the image is upright

Question 11

what does it mean if the magnification m is negative??

Answer 11

the image is inverted

Question 12

what shape is formed by refracted rays in spherical abberation??

Answer 12

a caustic curve