A lens forms a virtual image at a distance of 10 cm when the object is placed at 5 cm. What type of lens is it?

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Q: A lens forms a virtual image at a distance of 10 cm when the object is placed at 5 cm. What type of lens is it?

Solution: A virtual image is formed by a concave lens when the object is placed within its focal length.

Steps: 5

Step 1: Understand that a virtual image is one that cannot be projected on a screen and is seen through the lens.
Step 2: Know that a concave lens is a type of lens that diverges light rays and can create virtual images.
Step 3: Remember that for a concave lens, a virtual image is formed when the object is placed within the focal length of the lens.
Step 4: In this case, the object is at 5 cm, and the virtual image is at 10 cm, which indicates that the object is indeed within the focal length.
Step 5: Conclude that since a virtual image is formed with the object inside the focal length, the lens must be a concave lens.