Question #46978
The focal length of a curved mirror is -------- the radius of the spherical surface.
twice
equal to
half
one-quater
twice
equal to
half
one-quater
Expert's answer
By the geometry of the curvedmirrors, all rays which parallel to the optical axis will gather in the point
which is half of spherical surface of the radius
which is half of spherical surface of the radius
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