A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 2/3. Their equivalent focal length is 30 cm. What are their individual focal lengths (in cm)?

see full answer

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

- 75, 50

- 10, 15

75, 50

- 15, 10

answer is D.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

f1f2=23 . . .i1f1−1f2=130 . . .iiSolving equations i and iif2=−15 cm (concave)f1=10 cm (convex)

Watch 3-min video & get full concept clarity