If the lens is convex, the focal length must be more than 15 cms. If the image is upright, it must be a concave lens. Go to next question. Go back to the beginning. I want to choose another chapter.
Convex lens produces a virtual image only when the object distance is less than the focal length.
Back to the same question. Go to the next question. Back to the beginning - I want to choose another chapter. Because a virtual image can sometimes be formed by a convex lens and a concave lens always produces a virtual image. Go back to the same question.