alleryA convex lens of focal length 25 cm has power equal to:
A+1 D
B+2 D
C+4 D
D+25 D
Answer & Solution
Correct answer: C. +4 D
1. P = 1 / f, with f in METRES.
2. f = 25 cm = 0.25 m.
3. P = 1 / 0.25 = +4 D.
_Source: syllabus Science Ch 9 §9.3.6 Power Calculation_
Keep practising Refraction of Light and Lenses
Browse all Refraction of Light and Lenses questions for CBSE Class 10, or explore more Science topics.
Related questions
Match Rayleigh scattering principles with observed celestial colors:Match each atmospheric optical phenomenon with its underlying principle:Match each vision defect with its optical cause and corrective spectacle lens:Match each anatomical part of the human eye with its physiological duty:Match each optical component with its everyday role:Match each lens type with its optical power and focal length signs:Match each refractive index concept with its physical meaning:Match each optical law or formula with its mathematical definition: