Question

Two thin lenses of power +3.5 D and -2.5 D are placed in contact. Find the focal length of the lens combination.
a) 10cm
b) -1cm
c) 100cm
d) 0.001cm​

Answer 1

Answer:

B no is right amswer ok because that+ _=_Than+3.5d_2.5dto subtract=_1cm is wright answer

Answer 2

Answer:

B) is right answer

Explanation:

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