AB and CD, two spherical mirrors, form parts of a hollow spherical ball with its centre at O as shown in the diagram. If arc $\text{AB}=\frac{1}{2}$ arc CD, what is the ratio of their focal lengths? State which of the two mirrors will always form virtual image of an object placed in front of it and why.
CBSE FOREIGN - SET 1 2016
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Focal length of both the mirrors will be the same/ 1: 1
Mirror AB will always form virtual image as it is a diverging/convex mirror.
Mirror AB will always form virtual image as it is a diverging/convex mirror.
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