Question

Two lenses of power -2. 5D and 1.5D are places in contact find the total power of the combination of lens. Calculate the focal length of this combination?

Answer 1

Answer:

Peq =p1 + p2

=-2.5+1.5

=-1 D

p=1/f

so find focal length of each kendr by this the put in. formula

1/Feq=1/f1+1/f2

hope so helpful

Answer 2

Answer:

P = -1 and f = -1 cm

Explanation:

Given, p1 = -2.5d and p2 = +1.5d

We know that, P =p1 +p2

=-2.5 + 1.5

= -1 d

Now, f = 1/p = 1/-1 = -1 cm

I hope it's helpful

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