A plano convex lens of unknown material and unknown focal length is given. With the help of a spherometer, we can measure the:
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A plano convex lens of unknown material and unknown focal length is given. With the help of a spherometer, we can measure the:

G1 Physics · Accepted Answer

Step 1: A spherometer measures the sagitta (central height) h for a known distance between its legs. Step 2: The curvature radius follows R ≈ l²/(6h) + h/2 (for equilateral leg arrangement). Step 3: The material refractive index and focal length are not directly measured. Final answer: (B) radius of curvature.