A lens is a transparent medium bounded by two surfaces, with one or both surfaces being…
Physics · Class 12 · CBSE — Ray Optics & Optical Instruments
A lens is a transparent medium bounded by two surfaces, with one or both surfaces being spherical. The focal length of a lens is determined by the radii of curvature of its two surfaces and the refractive index of its medium with respect to that of the surrounding medium. The power of a lens is reciprocal of its focal length. If a number of lenses are kept in contact, the power of the combination is the algebraic sum of the powers of the individual lenses.
A double-convex lens of power P, with each face having same radius of curvature, is cut along its principal axis. The two parts are arranged as shown in the figure. The power of the combination will be:
- Zero
- P
- 2P
- \(\frac{P}{2}\)
Answer
(B) P
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