A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such away that the end closer to the pole is 20 cm away from it. Find the length of the image.
A
2 cm
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B
4 cm
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C
5 cm
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D
6 cm
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Solution
The correct option is D 5 cm The position of image of nearer end to mirror can be found out using mirror equation,
1v+1u=1f
⟹1v1=1−20−1−10
⟹v2=−20
Similarly position of image of farther end to mirror can be found out as