A converging lens with two curved surfaces has a front surface with radius of curvature 10 cm and the back surface with radius of curvature 20 cm. It is made of material with refractive index 1.5. The focal length of the lens is:

A converging lens with two curved surfaces has a front surface with ra

1.	A converging lens with two curved surfaces has a front surface with radius of curvature 10 cm and the back surface with radius of curvature 20 cm. It is made of material with refractive index 1.5. The focal length of the lens is:
A.	13.3 cm
B.	-13.3 cm
C.	4.4 cm
D.	-4.4 cm
Answer» B. -13.3 cm

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A converging lens with two curved surfaces has a front surface with radius of curvature 10 cm and the back surface with radius of curvature 20 cm. It is made of material with refractive index 1.5. The focal length of the lens is:

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