When an object is placed in front of a concave lens, a virtual image is formed. Which of the following must be true about the object distance and image distance?

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The object distance must be negative and the image distance positive.

Both object distance and image distance must be negative.

The object distance must be positive and the image distance negative.

Both object distance and image distance must be positive.

answer is D.

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Detailed Solution

Objects are always placed on the left side of a lens therefore, the object distance is always negative.
Virtual images are formed on the left side of a lens. Therefore, the image distance of a virtual image must be negative.

So, both object distance and image distance will be negative.

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