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The power of a lens is labeled as -5D. Which of the following statements is correct about the lens?
An object is placed 50 cm away from a convex lens . An image is formed 50 cm away on the opposite side of the lens . The focal length of the lens is
An object is placed 30 cm away from a concave lens . An image is formed 20 cm away on the opposite side of the lens . The focal length of the lens is
An object is 6 cm high and 30 cm from a convex lens. Its image is 90 cm from the lens . What is the height of the image formed?
A converging lens forms an image one-third the size of an object that is 24 cm from the lens. Find the focal length of the lens.