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Doppler Effect in Light Waves

A lamp of 250...

Question

A lamp of 250 candle power is hanging at a distance of 6 m from a wall. The illuminance at a point on the wall at a minimum distance from lamp will be

A

9.64 lux

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B

4.69 lux

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C

6.94 lux

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D

None of these

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Solution

The correct option is C 6.94 lux
Illuminance $L = \frac{P o w e r}{d^{2}} = \frac{250}{36} = 6.94 l u x$

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