Question

the convex lens of focal length 25 centimetre is placed in contact with the concave lens of the focal length 10 centimetre what is the focal length and power of the combination​

Answer 1

Explanation:

hey mate

(a) The power of the combination of lenses is the algebraic sum of the powers of the individual lenses. ⇒ P = 4 - 10 = - 6 D. (b) Suppose, the focal length of the combination of the lenses is f. Therefore, the focal length of the combination of the lenses is - 16.7 cm.