If the magnification power on your microscope's objective was 40x and the magnifying power on the eyepiece was 10x, the total magnification would be a.50x b.30x c.400x d.40x

Total magnification, m = 400 X

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".

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