Q3) Two biconvex lenses have f₁ = +15 cm and f2=+25 cm respectively.i) If the two lenses are placed in effective contact, what is the focal length of the compound lens?ii) If the two lenses are placed coaxially with a separation of dwhat are the front focal length and the back focal length ?==10 cm, with lens 1 to the left,40 cm, and a laser beam of di-iii) If the two lenses are placed coaxially with a separation dameter 2 mm is incident parallel to the axis onto lens 1, what is the diameter of the output beam ?

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Answered: Q3) Two biconvex lenses have f₁ = +15…

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