A lens is placed between a source of light and a wall. It forms images of area ${{A}_{1}}$ and ${{A}_{2}}$ on the wall for its two different positions. The area of the source or light is

Question

Accepted Answer

$\sqrt{{{A}_{1}}{{A}_{2}}}$

Answer

$\frac{{{A}_{1}}+{{A}_{2}}}{2}$

Answer

${{\left[ \frac{1}{{{A}_{1}}}+\frac{1}{{{A}_{2}}} \right]}^{-1}}$

Answer

${{\left[ \frac{\sqrt{{{A}_{1}}}+\sqrt{{{A}_{2}}}}{2} \right]}^{2}}$

Ray Optics and Optical Instruments

Question: A lens is placed between a source of light and a wall. It forms images of area ${{A}_{1}}$ and ${{A}_{2}}$ on the wall for its two different positions. The area of the source or light is

Ray Optics and Optical Instruments

Question: A lens is placed between a source of light and a wall. It forms images of area ${{A}_{1}}$ and ${{A}_{2}}$ on the wall for its two different positions. The area of the source or light is

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