Question

10. The radii of curvature of a double convex lens are
15 cm and 30 cm and the refractive index of its glass
is 1.5. Calculate the focal length of the lens.​

Answer 1

Explanation:

formula : 1/f = RI (-1) (1/R1 - 1/ R2)

= 1.5(-1)(1/15-1/30)

= 1.5(1/30)

= 1/f = -1/20

f= -20

so, the focal length is = -20 cm

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Answer 2

Answer:

The focal length of the lens.

Explanation:

Please find the attachment and hope it helps u.