Question

Define:
a) Lens
b) Center of curvature
c) Radius of curvature
d) Principal axis
e) Refractive index
f) Refraction
g) Dispersion
h) Spectrum ​

Answer 1

Answer:

a)lens - transparent material curved figure

Answer 2

Answer:

• a) lens - A lens is a spectrum refracting medium bounded by either two sperical surfaces or one surface sperical and other surface plane.

b) Centre of curvature- the center of the circle whose center lies on the concave side of a curve on the normal to a given point of the curve and whose radius is equal to the radius of curvature at that point.

• c) Radius of Curvature- In differential geometry, the radius of curvature, R, is the reciprocal of the curvature. For a curve, it equals the radius of the circular arc which best approximates the curve at that point. For surfaces, the radius of curvature is the radius of a circle that best fits a normal section or combinations.

d) Principal axis -a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly"

• e) Refractive Index - it is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater density. The refractive index variable is most commonly symbolized by the letter n or n' in descriptive text and mathematical equations.

f) Refraction - it is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another. This bending by refraction makes it possible for us to have lenses, magnifying glasses, prisms and rainbows. Even our eyes depend upon this bending of light.

• g) Dispersion- it is a statistical term that describes the size of the distribution of values expected for a particular variable. Dispersion can be measured by several different statistics, such as range, variance, and standard deviation.

h) Spectrum - A spectrum is a condition that is not limited to a specific set of values but can vary, without steps, across a continuum. The word was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism.

Explanation:

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