Explain with the help of a diagram, why the convex lens is also called a converging lens.
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A convex lens also known as converging type because it converges a parallel beam of light rays passing through it.
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Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.
When an object is placed at a distance of 15cm from a concave mirror, its image is formed at 10cm in front of the mirror. Calculate the focal length of the mirror.