Question

For what object distance of lens (u) is the corresponding image distance(v) not correct?
(a) -60cm
(b)-30cm
(c) -15cm
(d) -9cm​

Answer 1

(b) Serial number 6 is not correct as the object distance is between focus and pole so for such cases the image formed is always virtual but in this case, a real image is forming as the image distance is positive.

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S. No. Object distance u (cm) Image distance v (cm)

4 -20 +60

5 -18 90

6 -10 100