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Question
Which among the following light source can be used to find the focal length of a biconvex lens?
Which among the following light source can be used to find the focal length of a biconvex lens?
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Solution
The correct option is B Sunlight
To find the focal length of a biconvex lens easily, parallel light source is required. When parallel light falls on a convex lens, they converge at the focus. We can adjust the position of the lens such that all light rays coming through it meet at a point on the screen. By measuring the distance between the lens and the screen, we can calculate the value of the focal length of the lens. Here sunlight is the most accurate source of parallel light rays and hence, sunlight is most useful source to find the focal length of the lens.
To find the focal length of a biconvex lens easily, parallel light source is required. When parallel light falls on a convex lens, they converge at the focus. We can adjust the position of the lens such that all light rays coming through it meet at a point on the screen. By measuring the distance between the lens and the screen, we can calculate the value of the focal length of the lens. Here sunlight is the most accurate source of parallel light rays and hence, sunlight is most useful source to find the focal length of the lens.
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