Free NOCE MCQ Questions and Answers — Questions and Answers
Question 1: In what power is a lens measured?
- diopters (Correct answer)
- prisms
- microns
- add power
Correct answer: diopters
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?
- Cohere
- Disperse
- Diverge
- Converge (Correct answer)
Correct answer: Converge
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?
- Diffraction
- Refraction (Correct answer)
- Displacement
- Convergence
Correct answer: Refraction
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?
- 10 nanometers to 100 nanometers
- 100 nanometers to 290 nanometers
- 290 nanometers to 320 nanometers (Correct answer)
- 320 nanometers to 400 nanometers
Correct answer: 290 nanometers to 320 nanometers
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?
- Power
- Base curve
- Focal length (Correct answer)
- Major axis
Correct answer: Focal length
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.
Question 6: What is the term for the distance between the inside surface of a corrective lens and the surface of the eye?
- Seg drop
- Vertex distance (Correct answer)
- Sagittal depth
- Fitting cross
Correct answer: Vertex distance
Vertex distance is a measurement of how far a corrective lens is placed from the eye, and if it differs from the distance the doctor used during the eye exam, it may have an impact on the patient's effective power of correction.
Question 7: What component of a prescription for glasses serves as a gauge for the patient's myopia or hyperopia?
- Sphere (Correct answer)
- add power
- Cylinder
- Axis
Correct answer: Sphere
Whether a patient is myopic or hyperopic is determined by the prescription's sphere power. Myopia is shown by minus numbers, while hyperopia is indicated by positive values.
Free NOCE MCQ Questions and Answers
In what power is a lens measured?