Question:
A student plots a graph between inverse of magnification \( \frac{1}{m} \) produced by a convex thin lens and the object distance \( u \) as shown in figure. What was the focal length of the lens used?
A student plots a graph between inverse of magnification \( \frac{1}{m} \) produced by a convex thin lens and the object distance \( u \) as shown in figure. What was the focal length of the lens used?
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The inverse of magnification graph for a convex lens helps determine the focal length by analyzing the slope and intercept.
Updated On: Jan 6, 2026
- \( \frac{b}{c} \)
- \( \frac{b}{a} \)
- \( \frac{a}{b} \)
- \( \frac{c}{b} \)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the graph.
The plot of \( \frac{1}{m} \) against \( u \) is linear. Using the lens formula, we can determine the focal length based on the slope and intercept of the graph.
Step 2: Conclusion.
The focal length of the lens is \( \frac{a}{b} \), which corresponds to option (3).
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