alleryPower of a convex lens of focal length 50 cm is:
A-2 D
B+2 D
C+5 D
D+0.5 D
Answer & Solution
Correct answer: B. +2 D
1. Power P = 1 / f, where f is in metres.
2. f = 50 cm = 0.5 m.
3. P = 1 / 0.5 = +2 dioptres.
4. The positive sign indicates a converging (convex) lens.
_Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_
Keep practising Ray Optics and Optical Instruments
Browse all Ray Optics and Optical Instruments questions for Andhra Pradesh SSC (Class 10), or explore more Physics topics.
Related questions
Linear magnification produced by a converging lens for an object at 2F is:Cross-section of a convex lens looks like:Two lenses of powers +3 D and -5 D are placed in contact. The combination:A virtual image:Image formed by a convex lens with object at infinity is:If both surfaces of a thin lens have equal radii of curvature R, the lens is called:An object is placed beyond 2F from a convex lens. Image position is:Which is the principal use of a concave lens?