Worksheet # 1



Phys 481 Winter 2012

Worksheet # 3

Friday, January 13, 2012

Name

Questions (5 pts):

Consider a 100 W cylindrical light bulb (e.g. fluorescent lamps used in our room), whose length of 1 m is much larger than its radius. Assume that the light is mostly radiated through the long sides of the lamp. You are 2 m away from the lamp, looking at its side. Your eye’s iris diameter is 3 mm.

1) Find light intensity (irradiance) at your position. Don’t worry about exact numbers – an order of magnitude is fine.

2) Find the light power entering your eye. (Again, an order of magnitude is fine). Compare it to that in the case of 1 mW laser with the beam diameter of 1 mm.

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