Question

A convex lens and a concave lens are kept in contact with common principal axes. If f1 and f2 represents the focal length of the convex lens
and concave lens respectively then. If f1 = 2 cm and f2 = 5 cm then the equivalent focal length of the combination is :​

Answer 1

Answer:

In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed