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Question

A 16 cm long pencil is placed as shown in figure. The central point C is 45 cm away from a 20 cm focal length lens and 15 cm above the optic axis. Find the length of image.
151700_de9c4c8366d3405ea5de8ffd16c21408.png
  1. 14.2 cm
  2. 12.3 cm
  3. 17.1 cm
  4. 4.5 cm

A
4.5 cm
B
17.1 cm
C
14.2 cm
D
12.3 cm
Solution
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A 16 cm long pencil is placed as shown in figure. The central point C is 45 cm away from a 20 cm focal length lens and 15 cm above the optic axis. Find the length of image.
151700_de9c4c8366d3405ea5de8ffd16c21408.png
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