Define the terms :
(a) Dispersion (b) Bifocal lens
Answers
Dispersion
answer-:Dispersion 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.
Bifocal lens
answer-:A lens having one section that corrects for distant vision and another section that corrects for near visionBifocals are eyeglasses with two distinct optical powers. Bifocals are commonly ... John Isaac Hawkins, the inventor of trifocal lenses, coined the term bifocals in 1824 and credited .Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.
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Answer:
DISPERSION -it is a phenomenon in which the phase of velocity of a wave depends on its frequency. wave with higher frequency is diffracted more than those with lower frequency. hence colour are diffracted in VIBGYOR.
BIFOCAL LENS - bifocal lens are one having two segments with different refracting power , the upper for far vision and the lower for near vision.