Optics 3 Question 10

10. A diverging lens with magnitude of focal length 25cm is placed at a distance of 15cm from a converging lens of magnitude of focal length 20cm. A beam of parallel light falls on the diverging lens. The final image formed is (2017 Main) (a) virtual and at a distance of 40cm from convergent lens (b) real and at a distance of 40cm from the divergent lens (c) real and at a distance of 6cm from the convergent lens (d) real and at a distance of 40cm from convergent lens

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Answer:

Correct Answer: 10. (b)

Solution:

Here, f1=25cm,f2=20cm

For diverging lens, v=25cm

For converging lens, u=(15+25)=40cm

1v140=1+201v=120140=140v=40cm



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