A candle illuminates when in use; a refrigerator cools when in use
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Q1
candle : illuminate :: ______ : cool
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Q2
A lamp of 250 candle power is hanging at a distance of 6 m from a wall. The illuminance at a point on the wall at a minimum distance from lamp will be
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Q3
A student obtained an image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focusing a well illuminated distant object. What should the student do ?
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Q4
A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focussing a well illuminated distant object. What should the student do?
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Q5
Observe a candle flame carefully. The shape of a candle flame is: