A section of a sphere has a radius of curvature of `0.80 m`. Both, inside and ouside surfaces have a mirror like polish. What are the focal lengths of the inside and outside surfaces?
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When inside surface has mirror like polish, the mirror is convex, `f = R//2 = + (0.8)/(2) = 0.4 m` When outside surface has mirror like polish, the mirror is concave, `f = R//2 = - (0.8)/(2) = 0.4 m`
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