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A convex lens forms an image of magnification $- 2$ and height $6 cm$ . The height of object is

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6 cm

4 cm

2 cm

3 cm

answer is D.

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Detailed Solution

The height of the object is

3 cm

.
Given,
Height of image

= 6 cm

Magnification

= - 2

It is known that “Magnification is defined as the ratio of the height of the image to the height of the object.” Mathematically

magnification = \frac{height of image}{height of object}

On substituting the given values, we get the height of the object as

\Rightarrow - 2 = \frac{6}{height of object}

\Rightarrow height of object = - 3

Hence, the height of the object is

3 cm

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