Optics

Question 0

What is the formula for hc’?

Answer 0

-1000tanw. K
————– X. ——-
Fsp. K’

Question 1

What is the formula for Msu?

Answer 1

(2xr)+d. D=min blank size(45)

Question 2

What is he formula for spec mag?

Answer 2

Sm=. k
–
Fsp

Question 3

What is the formula for relative retinal image size?

Answer 3

RISR= rsmr
——
Rsml

Question 4

What is the formula for retinal image size?

Answer 4

Rsm= sm. x 60
—-
K’

Question 5

What is the visual comfort allowance on retinal image size?

Answer 5

0. 95%< risr< 1.05%

- -

Question 6

What is the other formula for finding hb’?

Answer 6

Hb’ = -1000tanw
————-
K’

Or
-k’x (4/3)x tanw

Question 7

What is the formula for finding Fsp?

Answer 7

Fsp= K
————-
1+(dxK)
D is in m

Question 8

Haw to find the axial length

Answer 8

1) K+K’=F
K=60
K’= given

2)k’= (4/3)1000
———–
52

Question 9

How to work out K’

Answer 9

K’ = K + F

Question 10

How to work out F

Answer 10

F= K’-K

Question 11

What Is the formula to find the position of On?

Answer 11

X =SA
—–
F+A

Question 12

What formula is used for finding the set diamiter?

Answer 12

1% -2% = 20 difference in v prism
————————-
Add

Question 13

What is the formula for relative curvature?

Answer 13

RC= 1.523. -1
————
n-1

Question 14

What is the formula for specific gravity?

Answer 14

Sg = density of material
——————–
Density of water

Question 15

What is the formula for v value?

Answer 15

Refractivity. =. (nd-1)
————– ————-
Mean dispersion. (Nf’- nc’)

Question 16

What is the formula for blue circle diamiter at a distance?

Answer 16

J=g. |K|
—
K’

Question 16

What is the formula for blur circle at a known l?

Answer 16

J=g.|K’-L’|
——-
K’

Question 17

What is the equation for tca?

Answer 17

Tca= p
-
V value

Question 18

How to find Bc diamiter?

Answer 18

L1’-L2’

Question 19

How to find linear pos of bc?

Answer 19

 Z

Question 20

How to find supportive pos of bc?

Answer 20

z= 0.5(L1’+L2’)