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Column I (optical system ) Column I...

Column I (optical system )

Column II (focal length )
`(P) 80 "cm" " " (Q) 40 "cm" " " (R) 30"cm" " " (S) 20"cm"`

Text Solution

Verified by Experts

For `(A) : (1)/(f) = (mu-1)((1)/(p_(1)) + (1)/(p_(2))) = (1.5-1) ((1)/(20) + (1)/(20)) = (1)/(20) implies f= 20"cm"`
For `(B) : (1)/(f) = ((1.5)/(4//3) -1)((1)/(20) + (1)/(20)) = (1)/(80) implies f = 80"cm"`
For `(C) : (1.5)/(v_(1)) - (4//3)/(oo) = (1.5-(4)/(3)) ((1)/(20))` & ` (1)/(f) - (1.5)/(v_(1)) = (1- 1.5)((1)/(-20)) implies f = 30 "cm"
For `(D) (1.5)/(v_(1)) - (1)/(oo) = (1.5-1) ((1)/(20))` & ` (4//3)/(f) - (1.5)/(v_(1)) = ((4)/(3) - 1.5)(-(1)/(20)) implies f = 40 "cm"
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