two lens of focal length 25 and -10 (convex and concave) respectily are placed in contact. find the power to combination
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Answer: The power of combination is -0.06 D.
Explanation:
Given,
focal length of convex lens, f₁ = 25 units
Power,P₁ = 1/f₁
= 1/25
= 0.04 D
focal length of concave lens, f₂ = -10 units
Power, P₂ = 1/f₂
= 1/(-10)
= -0.1 D
When the lenses placed in contact,
The power = P₁+P₂
= 0.04-0.1
= -0.06 D
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