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Find the focal length of the lens shown in the Fig..

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Find the focal length of the lens shown in the Fig..
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`(1)/(f)=(n_(rel)-1)((1)/(R_(1))-(1)/(R_(2)))`
`(1)/(f)=(3//2-1)((1)/(10)-(1)/((-10)))`
`rArr (1)/(f)=(1)/(2)xx(2)/(10)rArr f=+10cm` .
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Find the focal length of the lens shown in Fig.
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