In the figure a converging (lens 1) and a diverging lens (2) each have focal len

Question

In the figure a converging (lens 1) and a diverging lens (2) each have focal lengths of magnitude 30 cm. The lenses are separated by a distance of 10 cm. A ball of lint is 20 cm from the closest lens.

a) Where does the converging lens (1) form an image? and Where does the diverging lens form an image the lint ball (i.e. of the previous image from lens 1)?

In the figure a converging (lens 1) and a diverging lens (2) each have focal lengths of magnitude 30 cm. The lenses are separated by a distance of 10 cm. A ball of lint is 20 cm from the closest lens. a) Where does the converging lens (1) form an image? and Where does the diverging lens form an image the lint ball (i.e. of the previous image from lens 1)?

Explanation / Answer

The v for the first lens is the u for the second (consider distance between the lenses too!). a) v = +12 So u = -2 for 2 b) +2.143 cm

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