WBJEE · Physics · Ray Optics
A \(2.0 \mathrm{~cm}\) object is placed \(15 \mathrm{~cm}\) in front of a concave mirror of focal length \(10 \mathrm{~cm}\). What is the size and nature of the image?
- A \(4 \mathrm{~cm}\). real
- B \(4 \mathrm{~cm}\), virtual
- C \(1.0 \mathrm{~cm}\), real
- D None
Answer & Solution
Correct Answer
(A) \(4 \mathrm{~cm}\). real
Step-by-step Solution
Detailed explanation
\(\frac{1}{\mathrm{v}}-\frac{1}{15}=\frac{1}{-10} \Rightarrow \mathrm{v}=-30 \mathrm{~cm}\) \(m=\frac{-30}{-15}=2\), image size \(=4 \mathrm{~cm}\)
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