Owoc 0 C.
A Q.3. The image of a candle flame placed at a distance
of 30 cm from a mirror is formed on a screen
placed in front of the mirror at a distance of
60 cm from its pole. What is the nature of the
mirror ? Find its focal length. If the height of
the flame is 2.4 cm, find the height of its image.
State whether the image formed is erect or
inverted.
[Delhi 31/1/3 2017
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The distance of the object from the mirror, u = -30 cm
The distance of the image from the mirror, v = -60 cm
To find the foca length, we will use the formula:
Since, the focal length is negative, the nature of the mirror is convex i.e. it is a diverging mirror.
The focal length of the mirror is = -20 cm
The height of the flame = 2.4 cm
The height of its image would be:
Thus, the height of the image would be 4.8 cm.
The image would be real and inverted.
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