ABO NOCE Basic Opticianry Ophthalmic Optics 2

Question 1

What is the vergence of light rays that are parallel (coming from optical infinity)?

Accepted Answer

Zero vergence

Answer

Parallel rays from optical infinity have zero vergence because they are neither converging nor diverging.

Question 2

A lens with a power of -3.00 D will cause light rays to:

Accepted Answer

Diverge as if from a point 33 cm in front of the lens

Answer

A minus (concave) lens diverges light, with its virtual focal point located at 1/3 m = 33 cm in front of the lens.

Question 3

Which law states that the angle of incidence equals the angle of reflection?

Accepted Answer

Law of Reflection

Answer

The Law of Reflection states that when light hits a surface, the angle of incidence equals the angle of reflection measured from the normal.

Question 4

The index of refraction of a material is defined as the ratio of:

Accepted Answer

The speed of light in a vacuum to the speed of light in the material

Answer

Index of refraction (n) = speed of light in vacuum (c) divided by speed of light in the medium (v), so n = c/v.

Question 5

What is the primary optical difference between a plano-convex and a biconvex lens of equal power?

Accepted Answer

Biconvex has less spherical aberration

Answer

A biconvex lens distributes refraction more equally across two surfaces, reducing spherical aberration compared to a plano-convex design.

ABO NOCE Basic Opticianry Practice Test