Formulas

Question 1

To find Accommodation for telescopes

Answer 1

L’=M^2 x L

Question 2

Calculating stand height

Answer 2

fadd = l’ - z

Question 3

Calculating working distance for spec mounted and telescopes with reading cap

Answer 3

Spec mounted
- feq = 1/Feq

Reading cap
- frc = 1/Frc

Question 4

Second incident vergence calculation

Answer 4

L2 = L1’/1-dL1’

Question 5

Second emergent vergence calculation

Answer 5

L2’ = F2 + L2

Question 6

Field expansion

Answer 6

Expansion = 1/M
Then times original field by the number

Find M by -Fe/Fo

Question 7

Finding accommodation for stand magnifiers

Answer 7

Find leye= l’mag+z
Then accommodation = 1/leye

Question 8

Calculating required convergence

Answer 8

Convergence = PD (cm)/WD (M)

Question 9

Field of view for magnifier

Answer 9

FoV = Diameter of magnifier/ d x power of magnifier

Question 10

Accommodation when using a hand held lens

Answer 10

T = fo’ + fe’
Fe’ = 1/fe’

Question 11

Calculating magnifier to eye distance using plus lens magnifier

Answer 11

Feq = F1 + F2 - dF1F2

d is the answer

Question 12

Calculating distance between reading material and magnifier

Answer 12

L’eye = l’mag + (-z)

Then L’ = L + Fm
Then l = 1/L