ABO NOCE Basic Opticianry Ophthalmic Optics Questions and Answers 3

Question 1

A prism displaces light toward its:

Accepted Answer

Base

Answer

Light bends toward the base of a prism, while the image appears displaced toward the apex.

Question 2

In the spectacle magnification formula, which factor relates to the power of the lens?

Accepted Answer

Power factor

Answer

The power factor component of spectacle magnification accounts for the vergence-changing effect of the lens power.

Question 3

Which of the following best describes the term 'vergence' as used in ophthalmic optics?

Accepted Answer

The curvature of a wavefront of light

Answer

Vergence describes the degree of convergence or divergence of a wavefront and is measured in diopters.

Question 4

The nominal power of a lens is calculated using which formula?

Accepted Answer

F = (n₂ - n₁)/r

Answer

Surface power is calculated as F = (n₂ - n₁)/r, where n values are the refractive indices and r is the radius of curvature in meters.

Question 5

When a convex lens is placed in contact with a concave lens of equal but opposite power, the result is:

Accepted Answer

A plano (zero power) lens

Answer

Equal and opposite powers cancel each other out, resulting in a lens system with zero net power (plano).

ABO NOCE Basic Opticianry Practice Test