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Experiment to determine the focal length of a convex lens by u-v method |
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Answer» ation between u, v and f for a convex lens is, v-1 + u-1 = f-1 Using the proper sign convention, u is negative, u negative, v and f are positive. So we have, COMPARING with y = MX + c, graph between v-1 & u-1 is negative with slope –1 and intercept f-1 .The corresponding graph is as shown in FIGURE. Proceeding in the similar manner as discussed in case of a CONCAVE mirror the focal LENGTH of the lens can be calculated by measuring the coordinates of either of the points A, B and C. u–v Graph The u versus v graph is a hyperbola as shown in figure. By measuring the coordinates of point C whose coordinates are (2f, 2f) we can calculate the focal length of the lens. |
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