How many common refractive defects of vision are described?
ANine
BThree
CSeven
DEight
Answer & Solution
Correct answer: B. Three
1. Myopia and hypermetropia are two of them.
2. Presbyopia is the third.
3. So there are three.
_Source: NCERT Class 10 Science, Ch 11 'The Human Eye and the Colourful World'_
Related questions
Red is used for danger signals because it is:The sky is blue because the atmosphere scatters light of:Scattering of light by colloidal particles gives rise to the:Why do planets not twinkle?The twinkling of a star is due to atmospheric:Who was the first to use a glass prism to obtain the spectrum?The acronym for the colours of the spectrum is:A person with both myopia and hypermetropia needs which lenses?