Question #6d380

1 Answer
Gió
Oct 11, 2016

I think that it should be option (2)...

Explanation:

First I tried by plotting a ray diagram and I saw that effectively the image was moving away from the lens:
enter image source here

Then I used the lens equation: 1i+1o=1f
where:
i=distance of the image from the lens;
o=distance of the object from the lens;
f=focal length (assumed equal to 5 cm).
and I plotted the distances:
enter image source here
[distances in cm]

As you can see the distance of the image varies NON linearly implying a change in velocity and so an acceleration (while the object distance has a linear behaviour implying zero acceleration).

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