A converging lens has a focal length of 20cm in air. It is made of a material of refractive index 1.5. If it is immersed in liquid of refractive index 1.3, what will be its new focal length?
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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
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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