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The focal length of the lens as shown in the figure is:

 

Option: 1

5cm


Option: 2

10cm


Option: 3

15cm


Option: 4

20cm


Answers (1)

best_answer

 \frac{1}{f}=\left ( n_{rel-1} \right )\left ( \frac{1}{R_{1}}- \frac{1}{R_{2}}\right )=(\frac{3}{2}-1)*(\frac{1}{10}-\frac{1}{-10})

\frac{1}{f}=\frac{1}{2}*\frac{2}{10}

f=10cm

 

Posted by

Shailly goel

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