alleryA myopic person uses a lens of focal length -1.5 m. The power of this lens is:
A-0.67 D
B+0.67 D
C+1.5 D
D-1.5 D
Answer & Solution
Correct answer: A. -0.67 D
1. Power of a lens P = 1 / f (with f in metres).
2. Given f = -1.5 m.
3. Substitute: P = 1 / (-1.5) = -0.6666... D.
4. Rounded to two decimals, P approx -0.67 D.
5. The minus sign confirms a diverging (concave) lens, as expected for myopia.
_Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_
Keep practising Refraction of Light and Lenses
Browse all Refraction of Light and Lenses questions for Andhra Pradesh SSC (Class 10), or explore more Science topics.
Related questions
A child cannot read words on the blackboard clearly. The likely defect and correction are:The image formed on the retina by the human eye is:Scattering of light is most pronounced when the wavelength of light is:A 10-cm-tall object placed 30 cm in front of a 20-cm concave mirror has an image at:Cataract refers to:A myopic person's far point is 50 cm. The corrective lens has power:Tyndall effect refers to:The phenomenon of dispersion was first scientifically demonstrated by: