The relation between the focal length (f) and radius of curvature (R) of a spherical mirror is expressed as follows:
The focal length of the concave mirror is thus calculated using the given radius of curvature that is 150 cm.
Therefore, the focal length (f) = 150 cm / 2 = 75 cm
So, the focal length of the concave mirror is 75 centimeters.
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