the image of the flame of a candle in a concave mirror is formed at the distance of 30 cm in front of mirror height of the flame is 10 centimetre and its image is 5:30 high then the focus from the mirror is ???
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Answer:
-20 cm
Explanation:
u= -30cm
height of object = 10cm
height of image = - 5cm
now, according to question
=> m = -v/u = 1/0
=> m = +30/u = -5/10
=> u = -60cm
1/f = 1/v + 1/u
=> 1/f = -1/30 - 1/60 = -2-1/60
=> -20cm
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