If the radius of curvature of a concave mirror is 10 cm, then its focal length will be

Foundation

Physics Foundation

Reflection from spherical mirror

Question

5 cm.

15 cm.

10 cm.

2.5 cm.

College PredictorLive

Know your College Admission Chances Based on your Rank/Percentile, Category and Home State.

Get your JEE Main Personalised Report with Top Predicted Colleges in JoSA

The focal length (f) of a spherical mirror is half of its radius of curvature (R). The formula is:

$f = \frac{R}{2}$

Given R = 10 cm, we substitute into the equation:

$f = \frac{10}{2} = 5$

Therefore, the focal length is 5 cm.

Final answer: 5 cm.