Two thin lenses of power + 2.5 D and - 0.5 D are placed in contact. Find the power and focal length of the lens combination. Also calculate the focal length of the combination.

Two thin lenses of power + 2.5 D and - 0.5 D are placed in contact. Fi

1.	Two thin lenses of power + 2.5 D and - 0.5 D are placed in contact. Find the power and focal length of the lens combination. Also calculate the focal length of the combination.
Answer» Explanation:Solution,Here, we have,Power ONE of LENS = P₁ = + 2.5 D Power two of lens = P₂ = - 0.5 DTo FIND,Power and FOCAL length We KNOW that,Power combination = P₁ + P₂= + 2.5 + (- 0.5)= 2.5 - 0.5= 2 DHence, the power is 2 D.Now, Focal length,We know that,Power = 1/focal length⇒ 2 = 1/f⇒ 2/1 = f ⇒ f = 2 mHence, the focal length is 2 m.

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Two thin lenses of power + 2.5 D and - 0.5 D are placed in contact. Find the power and focal length of the lens combination. Also calculate the focal length of the combination.

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