A flower is placed 30 cm in front of a converging lens of focal length 20 cm.
Calculate the magnification of the image.
2. A diverging mirror with a focal length of 25 cm has a magnification of 0.50. How far apart are the object and the image?
1. According to the thin lens approximation, the magnification of the lens is given by (https://en.wikipedia.org/wiki/Lens#Thin_lens_approximation):
or
where is the focal length, is the distance from the flower to the lens and .is the distance from the image to the lens. Substituting the values into the first equation, obtain:
2. According to the first formula:
Now let's use the second formula:
The image and the object are
apart.
Answer. a) M = 2, b) d = 37.5 cm.
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