NEET 2018 Physics question
An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
Answer: (2)
Solution
Use the mirror formula with the sign convention (distances measured from the pole, real object in front of the mirror negative): cm. Initially cm: , so
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