Chapter 1 - Imaging

Question 0

What is the lens equation

Answer 0

1/v = 1/u + 1/f

Question 1

What does the power of a lens actually describe?

Answer 1

The amount of curvature added to waves passing through the lens.

Question 2

What is v in the lens equation?

Answer 2

Distance between the image and the lens (curvature after)

Question 3

What is u in the lens equation?

Answer 3

Distance between source (object) and the lens (curvature before)

Question 4

Is u negative or positive?

Answer 4

Negative

Question 5

The linear magnification of a lens is:

Answer 5

M = size of image (v)
———————
size of object (u)

Question 6

Number if alternatives given the number of bits

Answer 6

N = 2^I

Question 7

Number of bits given the number of alternatives

Answer 7

I = log2 (N)

Question 8

How can we reduce noise in an image

Answer 8

Replace pixels with the median of their neighbours

Question 9

How can we find edges in an image?

Answer 9

Using the Laplace rule.
• multiple a pixel by 4
• then subtract the values of the pixels immediately above, below, left and right.

Question 10

Laplace rule

Answer 10

Used to find edges by multiplying pixels by 4 and then subtract the value of pixels above below and next to it