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A student has to determine the focal length of a concave mirror by obtaining the image of a distant object on a screen . For getting best result he should focus : choose the correct option: 1. a distant tree or an electric pole 2. a well illuminated distant building 3. well lit grills of the nearnest window 4. a burning candle placed at the distant edge of the laboratory table
Asked by Mrinal | 20 Mar, 2012, 05:28: PM
answered-by-expert Expert Answer
option 4 will be the best option other wise option 3 would be  next choice.
Answered by | 21 Mar, 2012, 10:13: AM

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