A bi convex lens of focal length 10 cm is cut in two identical parts along a plane perpendicular to the principal axis. The power of each lens after cut is_____D
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(5)
The focal length of the bi-convex lens (f) can be calculated as follows:
… When the lens is cut into two halves, the focal length (f') of each part can be calculated as follows:
- 
…
Hence, the ratio of the powers for both the lenses can be given by
...
Substitute the value of the known parameter into equation to calculate the required power.
= 5D
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