Question

two lens of power 6 D and - 2D are combined to form a single lens the focus of a combination is​

Answer 1

POWER OF THE COMBINATION = 6D + (-2D)

                                                         = 4D

POWER = 1/ FOCAL LENGTH

4 = 1/F

F = 1/4

F = .25 M

OR 25CM

Answer 2

Answer:

25cm

Explanation:

This lens can be react as a convex lens......