You Wish to Read from a Single Lightbulb in a Lamp

You wish to read from a single lightbulb in a lamp at your desk.In order to get the same brightness on the page from a 25 W bulb as you can from 100 W bulb,how much closer do you need to bring the lamp to your book? Assume that the light bulbs are equally efficient.

A) 1/2 the distance
B) 1/8 the distance
C) 1/4 the distance
D) 1/16 the distance

Correct Answer:

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