In a certain optical setup, a combination of three similar thin convex lenses are arranged axially i

Question

In a certain optical setup, a combination of three similar thin convex lenses are arranged axially in contact. Then the total power of the combination and the total magnification in comparison to the power $p$ and magnification $m$ of each individual lens will be, respectively

Professor PC Thomas Classes · Answer

(c) : For thin lenses placed in contact, the equivalent power of the combination is the algebraic sum of the individual powers. Therefore, $P_{total} = P_1 + P_2 + P_3 = p + p + p = 3p$. The total linear magnification of a combination of lenses is the product of their individual magnifications. Thus, $M_{total} = m_1 	imes m_2 	imes m_3 = m 	imes m 	imes m = m^3$.