Free NOCE MCQ Questions and Answers

Question 1

In what power is a lens measured?

Accepted Answer

diopters

Answer

The ability to bend a coherent beam of light by 1 centimeter at a distance of 1 meter from the lens is known as the diopter, which serves as the fundamental unit of measurement for refractive power.

Question 2

What always happens to light beams that pass through a "plus" lens?

Accepted Answer

Converge

Answer

A plus-power lens is designed such that light rays travelling through it will converge into a single point.

Question 3

What is the primary process by which light moves from one medium into another with a different density known as?

Accepted Answer

Refraction

Answer

Light is distorted, or refracted, as it travels from one medium (like air) into another that is denser (like water).

Question 4

Which UV light spectrum is typically to blame for sunburns?

Accepted Answer

290 nanometers to 320 nanometers

Answer

Although the UV spectrum starts at about 400 nanometers, the skin is most severely harmed by wavelengths below 320 nm. Fortunately, the Earth's atmosphere largely absorbs wavelengths shorter than 290 nm.

Question 5

What determines the distance that a lens must travel to focus light?

Accepted Answer

Focal length

Answer

The distance from the lens's center to the place where the light rays condense into a single point, or focus, is known as the focal length.

NOCE - National Opticianry Competency Examination Practice Test

NOCE - National Opticianry Competency Examination Practice Test

Free NOCE MCQ Questions and Answers