A short linear object of length lies along the axis of a concave mirror of focal length…
Physics · JEE Advanced · NTA Exams — Optics
A short linear object of length lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror. The size of the image is approximately equal to
- \(\ell\left(\frac{u-f}{f}\right)^{1 / 2}\)
- \(\ell\left(\frac{\mathrm{u}-\mathrm{f}}{\mathrm{f}}\right)^{2}\)
- \(\ell\left(\frac{\mathrm{f}}{\mathrm{u}-\mathrm{f}}\right)^{1 / 2}\)
- \(\ell\left(\frac{\mathrm{f}}{\mathrm{u}-\mathrm{f}}\right)^{2}\)
Answer
(D) ( f u - f )^ 2
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