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A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15 cm from a converging lens of magnitude of focal length 20 cm. A beam of parallel light falls on the diverging lens. The final image is formed:

1. real and at a distance of 40 cm from the divergent lens
2. real and at a distance of 6 cm from the convergent lens
3. real and at a distance of 40 cm from the convergent lens
4. virtual and at a distance of 40 cm from the convergent lens

Correct answer: real and at a distance of 40 cm from the convergent lens

Solution

The correct option is right because the diverging lens first creates a virtual image that acts as the object for the converging lens. The converging lens then produces a real image at a distance of 40 cm from itself, which is consistent with the lens formula and the behavior of light through these two types of lenses.

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