Question

radius of curvature is 30cm then focal length​

Answer 1

Answer:

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Radius of Curvature =30cm

We know that

R=2× Focal length

put the values

30cm=2×F

$\huge\green{\boxed{\sf F=15cm}}$

Answer 2

Answer:

Radius of Curvature =30cm

We know that

R=2× Focal length

put the values

30cm=2×F