Question
Question: If a plano convex lens of focal length 10 cm is polished over its plane surface and a point object i...
If a plano convex lens of focal length 10 cm is polished over its plane surface and a point object is placed in front of it in such a way that image formed by it forms on object itself then distance between object and polished lens is –
A
5 cm
B
20 cm
C
10 cm
D
None of these
Answer
10 cm
Explanation
Solution
fL = + 10 cm, R ®
\ 
Ž f = – 5 cm
\ Object must be at 2f from polished lens.