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light-reflection and refraction — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencelight-reflection and refraction2 Marks
Question
What is the lens formula? State the lens formula for a thin lens with small aperture:
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Answer

  • The equation which gives the relation between object-distance $u$ image distance $v$, and focal length $f$ of a lens is called the lens formula.
  • The lens formula for a thin lens with small aperture is $\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$
  • Thin lens:
  • The lens for which the separation between the two surfaces, i.e., its thickness is much smaller (ignorable) than $u, v$ and $R$ is called a thin lens.
  • Small aperture :
  • The aperture which is much smaller than the radius of curvature of a lens is called a small aperature.

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