alleryStart learning →The mirror formula relating object distance u, image distance v and focal length f is
A1/f = 1/v - 1/u
B1/f = 1/v + 1/u
C1/u = 1/v + 1/f
Df = (u+v)/uv
Answer & Solution
Correct answer: B. 1/f = 1/v + 1/u
1. Similar triangles in the ray diagram give uv = uf + vf.
2. Divide throughout by uvf.
3. This yields the mirror formula 1/f = 1/v + 1/u.
4. Sign convention must be applied before substituting values.
_Source: AP/TS SCERT Class 10 Physical Science, "Reflection of Light at Curved Surfaces"_
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