Problem 15.36 Part A At noon on a sunny day, the intensity of sunlight is 1000 W

Question

Problem 15.36 Part A At noon on a sunny day, the intensity of sunlight is 1000 W/m2. A student uses a circular lens 5.6 cm in diameter to focus light from the sun onto a 3.4-mm-diameter spot. How much light power does the lens capture? Express your answer to two significant figures and include the appropriate units. PValue Units Submit My Answers Give Up Part B What is the intensity in the focused spot? Express your answer to two significant figures and include the appropriate units IValue Units Submit My Answers Give Up

Explanation / Answer

a)

Power captured by lens

P=IA=1000*[pi*0.0562/4]

P=2.463 W=2.5 W (approx)

b)

Intensity

I'=2.46/(pi*0.00342/4)

I'=2.7*105 W

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