ABO Optics & Lens Design

Question 1

What is the vergence formula used to find image vergence after a lens?

Accepted Answer

L' = L + F

Answer

L' = L - F

Answer

L' = F - L

Answer

L' = L × F

Question 2

A lens with a power of +5.00 D has a focal length of:

Accepted Answer

20 cm

Answer

50 cm

Answer

10 cm

Answer

5 cm

Question 3

Which lens type is used to correct myopia?

Accepted Answer

Concave (minus)

Answer

Convex (plus)

Answer

Plano

Answer

Prism

Question 4

The approximate index of refraction of standard crown glass is:

Accepted Answer

1.52

Answer

1.40

Answer

1.60

Answer

1.74

Question 5

A higher Abbe value (V-number) in a lens material indicates:

Accepted Answer

Less chromatic aberration

Answer

Greater impact resistance

Answer

Better UV protection

Answer

Higher refractive index

Question 6

The base curve of a spectacle lens primarily affects:

Accepted Answer

Cosmetic appearance and peripheral optics

Answer

UV transmission

Answer

Lens weight alone

Answer

Scratch resistance