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A student wants to project the image of a candle flame on a screen $80 cm$ in front of a mirror by keeping the candle flame at a distance of $20 cm$ from its pole. Distance between the object and its image is ____ $cm$ .

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Detailed Solution

A student wants to project the image of a candle flame on a screen

80 cm

in front of a mirror by keeping the candle flame at a distance of

20 cm

from its pole. Distance between the object and its image is

60 cm

.
It has been given that,
Object distance,

u = - 20 cm

.
Image distance,

v = - 80 cm

Distance between object and its image

= v - u

= 60 cm

So, the distance between object and image is

60 cm

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