Radius of curvature of the concave mirror is 36 cm.
To find the answer, we need to know about the relation between focal length and radius of curvature.
What's the relation between the radius of curvature and focal length?
- Mathematically, focal length= radius of curvature/2
- Radius of curvature= 2× focal length
What's the focal length of the concave mirror when sunlight converges to 18cm?
- When light from a far distance incident on a concave mirror, it converges to the focus point.
- As the sun light comes from very far distance, so it is converging to the focus point. So focal length= 18 cm.
What's the radius of curvature of the concave mirror?
Here, radius of curvature= 2×18 cm = 36cm
Thus, we can conclude that the radius of curvature of the concave mirror is 36cm.
Learn more about the radius of curvature here:
brainly.com/question/20068200
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