A) 2.25 cm
B) 6.00 cm
C) 6.50 cm
D) 36.00 cm
Correct Answer: B
Solution :
: According to displacement method for determining focal length of a convex lens, we know Height of object \[=\sqrt{Heights\text{ }of\text{ (}first\times second)\text{ }images}\] or \[h=\sqrt{{{I}_{1}}{{I}_{2}}}\]\[\Rightarrow \]\[h=\sqrt{4\times 9}\] \[\Rightarrow \]\[h=6\,cm\]You need to login to perform this action.
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