Chapter 1 - Imaging

Question 1

Define resolution

Answer 1

the size of the smallest feature that can be distinguished in an image.

Question 2

Bytes per pixel for full colour?

Answer 2

3 bytes

Question 3

Adding colour mixing (light)

Answer 3

Red,Green, and Blue mix to make ; R+G=Yellow R+B=Magenta G+B=Cyan R+G+B=white

Question 4

subtractive colour mixing (filters and pigments)

Answer 4

Magenta,Yellow, and Cyan mix to make ; M+Y=Red M+C=Blue Y+C=Green M+Y+C=Black (K)

Question 5

EM spectrum in increasing frequency and decreasing wavelength.

Answer 5

Radiowave Micromave Infrared Visible Light Ultravilot Xray GammaRay

Question 6

λ and f of red light

Answer 6

7x10^-7m 4x10^14Hz

Question 7

λ and f of green light

Answer 7

5x10^-7m 6x10^14Hz

Question 8

λ and f of blue light

Answer 8

4x10^-7m 7x10^14Hz

Question 9

define noise

Answer 9

Random changes to a pixel colour value that makes it clearly out of place

Question 10

define noise

Answer 10

Random changes to a pixel colour value that makes it clearly out of place

Question 11

Three types of converging lens

Answer 11

Biconvex, Plano-convex, concave-convex(converging minuscules)

Question 12

Three types of diverging lens

Answer 12

Biconvex, Plano-concave, convex-concave(diverging minuscules)

Question 13

Curvature of a wavefront =

Answer 13

1/radius in dioptre D

Question 14

Lens makers equation.

Answer 14

1/v = 1/u + 1/f (v=image distance, u=object distance, f=curvature added by lens. note make sure the distances are from the lens and +- depending on direction)

Question 15

power of a lens

Answer 15

1/f

Question 16

What happens to an image if the object is beyond 2F’?

Answer 16

Image is

• between F and 2F
• smaller (diminished)
• real image
• inverted

Question 17

What happens to an image if the object is at 2F’?

Answer 17

Image is

• at 2F
• same size
• real image
• inverted

Question 18

What happens to an image if the object is between F’ and 2F’?

Answer 18

Image is

• beyond 2F
• magnified
• real image
• inverted

Question 19

What happens to an image if the object is between F’ and lens?

Answer 19

Image is

• further back then object
• magnified
• virtual image
• erect

Question 20

Image magnification equation

Answer 20

I/0 = v/u

magnification =(I/O or v/u)

Question 21

normal sight near point and far point?

Answer 21

near point:25cm

Far point: infinite

Question 22

What causes short sight and what lens corrects it?

Answer 22

Too much converging power, so NP and FP are too close , focused infort of the retina.

fixed with a diverging lens (negative power)

Question 23

What causes long sight and what lens corrects it?

Answer 23

Too little converging power, so NP and FP are too far away , focused behind of the retina.

fixed with a converging lens (positive power)

Question 24

How do you measure distane from camera to an object to use in a ratio between two distances question.

Answer 24

Distance camera-object= 1/objectsize

(make sure to measre both objects in the same direction.)