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![[Post New]](/templates/default/images/icon_minipost_new.gif) 4 Apr 2008 19:40:40 IST
Accepted Answer [?]
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1=(ug-1)[ 1 - 1 ] ---(i)
f R1 R2
in a med:
1= (ug-uw)[ 1 - 1 ] --(ii)
f ' R1 R2
div (i)by (ii)
f'= (ug-1)
f (ug-uw)
since ug=1.5 , uw =1.3
f'=f*2.5
hence focal length in medium is >f
ans. (1)
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