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Question
A symmetric double convex lens is cut into two equal parts along a plane parallel to the principal axis. If the power of the original lens is 4 D, the power of cut lens will be:
A symmetric double convex lens is cut into two equal parts along a plane parallel to the principal axis. If the power of the original lens is 4 D, the power of cut lens will be:
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Solution
The correct option is B 4 D
If the lens is cut along the principal axis, then there will be no change in focal length of the lens because the radius of curvature will remain the same. Hence, the focal length will also remain unchanged. So, the power of lens remains unaffected.
If the lens is cut along the principal axis, then there will be no change in focal length of the lens because the radius of curvature will remain the same. Hence, the focal length will also remain unchanged. So, the power of lens remains unaffected.
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