4. A magnifying glass is made of a combination of a convex lens of power +20 D and a concave lens of power - 4D. If the least distance of distinct vision of the eye is 0.25 m, calculate the
magnifying power.

According to valence bond theory, which orbitals overlap in the formation of the bond in hf according to valence bond theory, which orbitals overlap in the formation of the bond in hf 2s on h and 2p on f 1s on h and 2s on f 1s on h and 1p on f 1s on h and 2p on f 1s on h and 3p on f