Lens Calculator
Calculate focal length, object distance, image distance, and magnification for thin lenses
Enter any two values to calculate the third (1/f = 1/d_o + 1/d_i)
Sign convention: Positive for real images/objects, negative for virtual. Converging lens has positive focal length.
Formulas Used
1/f = 1/d_o + 1/d_i (thin lens equation)
M = -d_i / d_o (magnification)
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: University Physics
by Young & Freedman
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.