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light-reflection and refraction — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencelight-reflection and refraction3 Marks
Question
Define the magnification produced by a lens. Explain it in brief.
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Answer

  • The magnification produced by a lens is defined as the ratio of the height of the image to the height of the object.
  • It is represented by the letter $m.$
  • If $h$ is the height of the object and $h$' is the height of the image formed (given) by a lens, then the magnification produced by the lens is given by
  • $m=\frac{\text { Height of the image }}{\text { Height of the object }}=\frac{h \prime}{h} \ldots . . .(10.16)$
  • Magnification produced by a lens is also related to the object distance $u$ and the image distance $v.$
  • This relationship is given by
  • Magnification $m=\frac{h 1}{h}=\frac{v}{u} \ldots . .. (10.17)$

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