Define the power of lens. The power of lens is +2.0 D. (i) Find the focal of lens in m. (ii) Name the kind of this lens. Explain with the help of figure whether this lens would converge or divere a beam of lens.

Define the power of lens. The power of lens is +2.0 D. (i) Find the f

1.	Define the power of lens. The power of lens is +2.0 D. (i) Find the focal of lens in m. (ii) Name the kind of this lens. Explain with the help of figure whether this lens would converge or divere a beam of lens.
Answer» Solution :(i) The ability of a LENS to converge/ diverge a BEAM of LIGHT rays is expressed in terms of its power (P), It is the inverse of focal LENGTH F (in meters). Hence power of a lens is given by the relation `P=1/(f("in meters"))` `F=1/P=+1//2=+0.5m` (ii) Convex lens