申論題

7. Suppose you have a glass lens of radii r_i = 10.0 cm and r₂ = -7.0 cm, a thickness of 1.5 cm, and refractive index 1.70. r₁ and r₂ are in contact with the air. An object 6.0 cm high is place 25.0 cm in front of the first surface of the lens.

(a) (6%) Calculate the power and image-space focal length of the lens.