A concave mirror forms a real image of h...

A concave mirror forms a real image of height twice the size of the object. Now the object and the screen are so moved that a real image of height three times the size of the object is formed. If the displacement of the screen is 18 cm, determine the displacement of the object and the focal lenght of the mirror.

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The correct Answer is:

displacement of the object towards the mirror = 3 cm; 18 cm

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