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Question

Calculate the focal length of the thin lens shown in the figure. The points C1 and C2 denote the centres of curvature.

  1. 20 cm
  2. 40 cm
  3. 60 cm
  4. 80 cm


Solution

The correct option is B 40 cm
R1 = +10 cm and R1 = +20 cm
The focal length is given by
1f=(μ1)(1R11R2)=(1.51)(110 cm120 cm)=0.5×120 cm=140 cmor, f=40 cm
 

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