Question

Which type of objective lens are there in compound microscope. in one line​

Answer 1

A compound microscope has multiple lenses: the objective lens (typically 4x, 10x, 40x or 100x) is compounded
by the eyepiece lens to obtain a high magnification.

Answer 2

A compound microscope has multiple lenses: the objective lens (typically 4x, 10x, 40x or 100x) is compounded (multiplied) by the eyepiece lens (typically 10x) to obtain a high magnification of 40x, 100x, 400x and 1000x. Higher magnification is achieved by using two lenses rather than just a single magnifying lens.