Question

Question 28. Two thin lenses of power +4.5 D and -3.5 D are placed in contact. Find the power and
focal length of the lens combination. Will the combination behave as a concave lens or a convex lens?​

Answer 1

Answer:

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Answer 2

Answer:

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Explanation:

4.5-----------(1)

-3.5----------(2)

TO FIND POWER:-

P= (1) + (2)

P= 4.5 + (-3.5)

P= 4.5 - 3.5

P= 1 D (diopter)

TO FIND FOCAL LENGTH (in combination)

1/f=  1/f1 + 1/f2

      or

1/f= 1/(1) + 1/(2)

1/f= 1/4.5 + 1/-3.5

(after reciprocal)

f= -0.06 (approx)

NOTE:- If focal length is negitive then it will be a Concave Lens.

hope it helps you :)