Answer:
Total magnification, m = 400 X
Step-by-step explanation:
It is given that,
Magnification power on microscope's objective, m₁ = 40 X
Magnifying power on the eyepiece, m₂ = 10 X,
We have to find the total magnification. Total magnification of an image is given by the product of microscope's objective and magnifying power of the eyepiece i.e.
m = m₁ × m₂
m = 40 X × 10 X
m = 400 X
So, the total magnification would be 400 X. Hence, the correct option is (c) "400 X".