You Wish to Read by the Light of a Lamp

question 73

Multiple Choice

You wish to read by the light of a lamp with a single lightbulb 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

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