Question

A converging lens has a focal length of 20cm in air. It is made of refractive index 1.6. If it is immersed in a liquid of 1.3 find its new focal length

Answer 1

1/20=(1.5-1)(1/R1+1/R2)

according to second condition

1/f=(1.5/1.3/-1)(1/R1+1/R2)

after dividing both equations u will get answer

Answer 2

hope it helps you

1/20=(1.5-1)(1/R1+1/R2)

according to second condition

1/f=(1.5/1.3/-1)(1/R1+1/R2)

after dividing both equations u will get answer

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