1.

If two thin lenses are kept coaxially together, then their power is proportonal (R_(1),R_(2) "being the radii of curved surfaces") to

Answer»

`R_(1) + R_(2)`
`[(R_(1) + R_(2))/(R_(1)R_(2))]`
`[(R_(1)R_(2))/(R_(1)R_(2))]`
NONE of these

Solution :`P=(1)/(f_(1))+(1)/(f_(2))=(2)/(R_(1))+(2)/(R_(2))=2((R_(1)+R_(2))/(R_(1)R_(2)))orp APPROX ((R_(1)+R_(2))/(R_(1)R_(2)))`


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