An object is placed at a distance of 30 cm from the pole of a concave mirror. If its real and inverted image…

An object is placed at a distance of 30 cm from the pole of a concave mirror. If its real and inverted image is formed at 60 cm in front of the mirror, the focal length of the mirror is :
  1. − 15 cm
  2. − 20 cm
  3. + 20 cm
  4. + 15 cm

Solution

–20 cm

Asked in: CBSE

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