the focal length of the combination

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Gupta Ravi

Asked: January 6, 2025In: Class 12 Physics

Two thin lenses of power + 6 D and – 2 D are in contact. What is the focal length of the combination?

P = P₁ + P2 = (+ 6 D) + (-2D) = + 4 D Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Session 2024-2025.

Gupta Ravi

Asked: January 5, 2025In: Class 12 Physics

A converging lens is kept coaxially in contact with diverging lens – both the lenses being of equal focal lengths. What is the focal length of the combination?

Let focal length of converging lens f₁ = + f and focal length of diverging lens f₂ = -f. If focal length of combination be feq, then 1/feq = 1/f1 + 1/f2 = 1/(+f) + 1/(-f) = 0 feq = ...

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