. What is the focal length of double concave lens kept in air
with two spherical surfaces of radii Ri - 30 cm, and
Ry - 60 cm. Take refractive index of lens as n = 1.5( ).
A) -20 cm B) -30 cm et 40 cm D) -90 cm
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sorry mujhe bhi nahi pata hai ki 17898
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40 cm
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