18. AB and CD, two spherical mirrors form parts of a hollow spherical ball with its centre at 0,
as shown in the diagram. If arc AB = 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?
Answers: 2
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18. AB and CD, two spherical mirrors form parts of a hollow spherical ball with its centre at 0,
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