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The distance between the center of curvature and pole of a spherical mirror is called radius of curvature. Focal length is half of the radius of curvature. So f = 24/2 = + 12 cm It is a convex mirror
However, as discussed above, in the small-angle approximation, the focal length of a spherical mirror is one-half the radius of curvature of the mirror, or f=R/2. Inserting this into Equation 2.3. 11 gives the mirror equation: 1do+1di=1f⏟mirror equation
During sunrise, the light rays coming from the Sun have to travel a greater distance in the earth's atmosphere before reaching our eyes. In this journey, the shorter wavelengths of lights are scattered out and only longer wavelengths are able to reach our eyes. ... Therefore, the Sun appears reddish early in the morning.
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