An objects is placed in front of a conca...

An objects is placed in front of a concave mirror. The mirror forms an image of magnification 2 on a screen. Now the object is moved such that on shifting the screen another 20 cm from the mirror, the image formed on the screen is magnified three times. Determine the displacement of the object and the focal length of the mirror.

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The correct Answer is:

3.33 cm; 20 cm

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