Question

Two lamps of 1 cp and 60c.p luminous intesties are saprated by 100cm. Find where the line joining them a photometer screen should be place so that its both ends are illuminated equally.

Answer 1

Answer:

Let distance between 8 Cd lamp and screen be xm

Distance between 32 Cd lamp and screen = (120−x)m

Under equal illumination,

x28=(120−x)232

=> x = 40 cm

So the distance from 8 Cd lamp is 40 centimeters.

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