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  • A spherical mirror forms diminished virtual image of magnification . Focal length is <img alt="\mathrm{18\ cm}" src="https

A spherical mirror forms diminished virtual image of magnification 1/3. Focal length is \mathrm{18\ cm}. The distance of the object is:

Option: 1

\mathrm{18\ cm}


Option: 2

\mathrm{36\ cm}


Option: 3

\mathrm{48\ cm}


Option: 4

infinite


Answers (1)

best_answer

Here, the given mirror is a convex mirror.
\mathrm{\text { As, } m=\frac{f}{f-u}}
\mathrm{\text { or } \quad \frac{1}{3}=\frac{18}{18-\mathrm{u}} \quad \text { or } \quad 3 \times 18=18-\mathrm{u} \quad \text { or } \quad \mathrm{u}=-36 \mathrm{~cm}}

Posted by

Ajit Kumar Dubey

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