Devices

Question 1

Relative Size Magnification

Answer 1

Increasing size of image:

• closed circuit TV
• large print TV
• large print objects (i.e. clocks, books)

Question 2

Relative Angular Magnification

Answer 2

Increase angle of image:

• telescope
• telemicroscope

Question 3

Relative distance magnification

Answer 3

Decrease distance of image:

• watching TV closer
• sitting closer to the front of the class
• high adds (use of accommodation)

Question 4

(FORMULA)

Magnification with a MS without accommodation

Answer 4

Mag = Fm/Fa

Fm = focal length of MS

Question 5

Formula for Equivalent Power for accommodation and microscope use

Answer 5

Fe = Fm + Fa

Question 6

Anticipated add to read 1M

Answer 6

Kestenbaum equation.

Inversion of distance VA. Eg: 20/80
Add: +4.00D

Question 7

Magnification of a telescope

Answer 7

M = -Foc /Fobj

Question 8

Characteristics of a Galilean telescope

Answer 8

• negative ocular, positive objective
• shorter/lighter
• mag up to 4x
• exit pupil is inside
• image is upright

Question 9

Characteristics of a Keplerian telescope

Answer 9

• positive ocular and objective
• longer/heavier
• mag greater than 4x
• exit pupil is outside
• image is inverted

Image is brighter and FOV larger because exit pupil is closer to entrance pupil