Class 11 Physics simulations · Units and Measurements

Spherometer

Lower the central screw onto a curved lens and calculate its radius of curvature from the sagitta.

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What to notice

The three legs form an equilateral triangle; the central screw measures how far the curved surface rises (h).

Key relation

R = l² / 6h + h / 2

Try this

Keep the leg spacing fixed and halve h. Does R double?

What you can change

• Complete screw turns: 0 to 4
• Circular-scale division: 0 to 99
• Leg spacing l: 20 to 60 mm

More in Units and Measurements

• Dimensional analysis of a pendulum
• Propagating errors: density of a cube
• Parallax: view from the right angle
• Micrometer screw gauge
• Measurement uncertainty
• Vernier caliper

See all Class 11 Physics simulations or every Physica simulation.