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1A convex mirror of focal length 7.4cm produced an image on it axis 2.3cm away...

1A convex mirror of focal length 7.4cm produced an image on it axis 2.3cm away from the mirror, calculate the position of the object
2 suppose a stationary siren emits a note frequency 440HZ as the train approaches it with 30m/s.what frequency will be received on the train (take speed of wave to be 331m/s)?
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Asked by OWOBI SUNDAY on 20th October, 2019
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