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Question

A convex lens of focal length f is cut into two halves as shown. Light rays parallel to the principal axis are incident on one half of the lens (say L1) This will form an image at
330635_fb80ddcf94664894a0de7e7dfc67bb7c.png
  1. f
  2. f/2
  3. f/4
  4. 2f

A
f
B
f/2
C
2f
D
f/4
Solution
Verified by Toppr

If a convex lens is cut horizontally from optical axis then the radius of curvature will remain same.
As focal length is given by 1f=(μ1)(1R11R2) (len's maker formula)
As R1 and R2 do not changes.so,there will be no change in focal length it will remain f.
hence,option A is correct.

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