Correct Answer - D
(i) For (i) ` (u_(2))/(v_(1)) - (1)/(oo) = (u_(2)-1)/(6)`
`v_(1) = (3)/(2) xx 6 xx2 = 18 "cm"`
For plane surface : `I_(1) rarr "object"`
`d_("apperent") = (n_(2))/(n_(1))xx d_("actual") = (n_(2))/(n_(1)) xx (18-R)`
`(1)/(3//2)xx(18-6) = 8 "cm"`