What is the focal length of a biconvex lens of radii of each surface 50 cm and refractive index 1.5?

40.4 cm 75 cm 50 cm 80 cm

50 cm

Use Lens Maker's Formula : \(\frac{1}{f} = (μ-1) ( \frac{1}{R1} - \frac{1}{R2}\) )