A thin rod of length 10 cm is placed along the axis of a concave mirror of focal length 30 cm such that its real diminished image just touches the rod. What is the length of the rod image?
Text Solution
Verified by ExpertsThe correct answer is:
B
Here image is diminished so it is present between C and F, and one end of it lies on C.
For B end u = – 70 cm, f = – 30 cm
v = – 
= – 52.5
size of image = A'B' = 60 cm – 52.5
= 7.5 cm
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