when a lens is cut from perpendicular
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If lens is cut along the principal axis then there will be no change in the focal length of lens. but it is cut perpendicular to principal axis, then focal length will be twice the original one.
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When the lens is cut perpendicular to the principle focus, then there is less deviation of the rays of the light.
Explanation:
- As the rays of light passing parallel to the ‘principal axis’ meet at the focus, on cutting the lens the deviation will be half, and hence it will converge or diverge at an increased length.
- This length is known as the ‘focal length’ of the spherical mirror and. As a result the ‘focal length’ of the spherical mirror will become double of the initial focal length.
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