Question

42. Four lenses L1, L2, L3 and L4 having focal length
X5 cm, 7 cm, 20 cm and 100 cm respectively are
provided. The lenses most likely used as objective
yfand eyepiece to construct a compound microscope."
are respectively
G (1) L4 and L1 (2) L1 and L2
& L, and L4
(4) L3 and L4​

Answer 1

Answer:

1. will be correct answers

Answer 2

Answer is L1 and L2.

◆Compound microscope MAGNIFICATION ,

M= MoMe

Mo ,Me - magnification of objective and eyepiece respectively.

◆Mo = -L/Fo

Me = 25 / Fe

◆Since Magnifications are INVERSELY proportional to focal lengths.,

◆Smallest numbers of focal length causes highest magnification.

That is, 5cm and 7cm