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 AB = :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.
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Answered by
334
If the arc length AB and arc length CD are part of the same hollow spherical ball, then their radii are the same.
Then their focal lengths are also same , as focal length = radius/2.
Convex mirror forms a virtual image always as the rays incident on it are diverged away.
Then their focal lengths are also same , as focal length = radius/2.
Convex mirror forms a virtual image always as the rays incident on it are diverged away.
kvnmurty:
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Answered by
79
AB and CD are in same hollow spherical ball so their radii will be same
WKT f=R/2 therefore the focal length will be 1:1 ratio
AB will have virtual image because it is diverging
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