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Light – Reflection and Refraction — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLight – Reflection and Refraction2 Marks
Question
Write down the magnification formula for a lens in terms of object distance and image distance. How does this magnification formula for a lens differ from the corresponding formula for a mirror?
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Answer

Magnification (m) fomula for a lens is:$\text{m}=\frac{\text{v}(\text{distance of image})}{\text{u}(\text{distance of object})}$
Magnification fomula for a mirror has a minus sign (-) but the Magnification fomula for a lens has to minus sign. Magnification fomula for a mirror is: $\text{m}=-\frac{\text{v}(\text{distance of image})}{\text{u}(\text{distance of object})}$

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