Its a very easy question.
it came in my board xams,so i want to confirm the answer.
please help:)
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3 Answers
1my working
from the convex lens:
u=--20; f=+15
(1/v)-(1/u)=1/f
v=60 cm
image is formed 25 cm to the right of concave wich behave as object now:
u=+25;f=--25cm
(1/v)-(1/u)=1/f
1/v=0;
so v=∞;
