Home › UP Board Class 10 › physics › Human Eye and the Colourful World › A boy can see distant objects clearly but cannot…
A boy can see distant objects clearly but cannot read his textbook held at 25 cm. He suffers from:
AMyopia
BHypermetropia
CPresbyopia
DCataract
Answer & Solution
Correct answer: B. Hypermetropia
1. He sees distant objects well, so his far point is fine.
2. He cannot see clearly at 25 cm, so his near point lies farther.
3. Pushed-back near point is the defining feature of hypermetropia.
4. Convex lenses of suitable focal length correct it.
5. So the defect is hypermetropia.
_Source: NCERT Class 10 Science Ch 11 'Human Eye and the Colourful World'_
Related questions
The bluish colour scattered toward the sides of a sunbeam is described by:Why do planets NOT twinkle though stars do?The Tyndall effect refers to the:Which of the following causes the colour of the clear sky to appear blue at noon?Two convex lenses of focal lengths 20 cm and 50 cm are placed in contact. The power of theWhy are danger signals such as stop lights and fire engines coloured red?The phenomenon of bending of light caused by gas density variations in the atmosphere is cA myopic eye can be corrected by: