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Image Formation of 2D Objects

A thin rod of...

Question

A thin rod of 5 cm length is kept along the axis of a concave mirror of 10 cm focal length such that its image is real and magnified and one end touches the rod . Its magnification will be

A

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B

2

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C

3

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D

4

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Solution

The correct option is A 1
$\begin{matrix} I m a g e i s r e a l a n d m a g n i f i e d a n d o n e e n d t o u c h e s t h e e n d S o, m = \frac{l}{f} u = 2 f s o, 5 \times 2 = 10 c m M = \frac{s i z e o f o b j e c t}{s i z e o f i m a g e} = \frac{10}{10} = 1 H e n c e, t h e o p t i o n A i s t h e c o r r e c t a n s w e r . \end{matrix}$

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