A) 50 cm
B) 25 cm
C) 100 cm
D) 40 cm
E) 125cm
Correct Answer: A
Solution :
The focal length of the combination is \[\frac{1}{F}=\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}\] Given, \[{{f}_{1}}=50\,cm,{{f}_{2}}=50\,cm\] \[\therefore \] \[\frac{1}{F}=\frac{1}{50}+\frac{1}{50}=\frac{2}{50}\] \[\Rightarrow \] \[F=\frac{50}{2}=25\,cm\] Object when placed at centre of curvature forms a real, inverted image of same size as object\[=(2\times 25=50\text{ }cm)\].You need to login to perform this action.
You will be redirected in
3 sec