Question

Define the focus if concave mirror. If the radius of curvature of a convex mirror is 30 meter. what would be its focal length

Answer 1

Define the focus?

In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle.

Focal length= radius of curvature/2

=> 30/2

=> 15 m

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