9.5

9

10 4 u cutepooja

congratulations keep up the good work

9 4 u

happy birthday

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ok.........but still i am not convinced if u get a better explanation do tell me

u can com to know by drawing lewis dot structures

no i dont agree wid resin see guys refractive index is always comparitive i.e with respect to other media so how is it possible to compare it wid air then add up????really confused

ya i too think so.........anyways thanx 4 helping me out

ya i think you r right i dunno how cud i go wrong with this ...... so do u say the given ans is wrong ?????

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yup u r perfectly correct thats wat i also did

1/f=(1.7-1)(-1/12.5-1/12.5)

1/f=-0.112

f=-8.29cm