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Refraction through a Lens — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsRefraction through a Lens2 Marks
Question
What do you understand by the term magnification? Write expression for it for a lens, explaining the meaning of the symbols used.
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Answer

The term magnification means a comparison between the size of the image formed by a lens with respect to the size of the object.
For a lens: Magnification ' $m$ ' is the ratio of the height of the image to the height of the object.
$m=\frac{\text { Height of image }\left(h^{\prime}\right)}{\text { Height of object }(h)}=\frac{h \prime}{h}$

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