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A student determines the focal length of a device X, by focussing the image of a far off object on the screen positioned as shown in the figure alongside.The device X is a :(1) Convex lens(2) Concave lens(3) Convex mirror(4) Concave mirror |
Answer» A student determines the focal length of a device X, by focussing the image of a far off object on the screen positioned as shown in the figure alongside.![]() The device X is a : (1) Convex lens (2) Concave lens (3) Convex mirror (4) Concave mirror |
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