FREE NOCE MCQ Questions and Answers
In what power is a lens measured?
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.
What is the primary process by which light moves from one medium into another with a different density known as?
Light is distorted, or refracted, as it travels from one medium (like air) into another that is denser (like water).
What component of a prescription for glasses serves as a gauge for the patient's myopia or hyperopia?
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.
Which UV light spectrum is typically to blame for sunburns?
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.
What is the term for the distance between the inside surface of a corrective lens and the surface of the eye?
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.
What always happens to light beams that pass through a "plus" lens?
A plus-power lens is designed such that light rays travelling through it will converge into a single point.
What determines the distance that a lens must travel to focus light?
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.