A) 25 cm
B) 50 cm
C) 100 cm
D) 10 cm
Correct Answer: B
Solution :
Key Idea: Image is formed at focus. We know that Power \[(P)=\frac{\text{1}}{\text{focal}\,\text{length}\,\text{(m)}}\] Given \[P=-2D\] \[\therefore \] \[\text{Focal}\,\text{length}\,=-\frac{1}{2}=-0.5\,m\] \[\Rightarrow \] \[F=-50\,cm\] Hence, maximum distance of an object, which he can see without spectacles is 50 cm.You need to login to perform this action.
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