Question

of 15 cm from a convex lens of focal length 10 cm On
placed at in focus such that the image formed by the com
itselfThe focal length of the convex mirror is
1)20 cm
2) 10 cm
3) 15 cm
4) 30 cm


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Answer 1

i think the Q is in complete

but the answer is

image formed will be at infinity means option 1!!!!

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