The focal length of a concave mirror is 0.15 m. What will be its radius of curvature?

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Solution

Step 1:Given data
The focal length of a concave mirror, $f = 0.15 m$
According to sign conventions, the focal length of the concave mirror is negative
Therefore $f = - 0.15 m$
Step2:Finding the radius of curvature, R
the radius of curvature, R is related to the focal length of the mirror as
$R = 2 f$
on substituting the values, we get
$R = 2 \times (- 0.15)$ $= - 0.3 m$
Hence, the radius of curvature of the concave mirror is $- 0.3 m$

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