If the radius of curvature of each face of the biconcave lens, made of – McqOptions

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1.	If the radius of curvature of each face of the biconcave lens, made of glass of refractive index 1.25 is 50 cm, then what is the focal length of the lens in air?
A.	30 cm
B.	-30 cm
C.	5 cm
D.	-5 cm
Answer» C. 5 cm

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