An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is 25 D . Focal length of each of the convex lens is :

Question

TestHub · Accepted Answer

We know that P eq ​ = Σ P i ​ ∴ given all lenses are identical ​ ∴ 5 P = 25 D ∴ P = 5 D ∴ f 1 ​ = 5 ⇒ f = 5 1 ​ m = 20 cm ​ Hence option (1)

Physics - Geometrical Optics Question with Solution | TestHub

Options:

Doubts & Discussion