Question

A concave lens is kept in
contact with a convex lens of
focal length 20 cm. The
combination behaves as a
convex lens of tocal length
Socm Find the power of the
concave lens
answer
+3D
-100/3
+100/3
-3D​

Answer 1

Answer:

sorry i can't understand

Answer 2

Answer:

+100/3

Explanation:

+100/3...,...,..,..,..