When length of a compound microscope tube increase, its magnifying power

Question

G1 Physics · Accepted Answer

Derived solution: Step 1: For a compound microscope use the objective and eyepiece magnifications, with M ≈ (L/fₒ)(D/fₑ) in normal adjustment (or the corresponding near-point form). Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is decreases. Therefore the correct option is A.