PHYS 1070 Lecture Notes - Lecture 10: Thin Lens, Far-Sightedness, Retina
25 Mar 2015
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Phys1070: intro physics for life sci - lecture 10: lenses, power and accommodation. Moving from one curved spherical interface to two. This is the most common system we will study. We can derive the power for each side of the lens, one for each curved surface. Lens creates an image in the same way as we"ve been studying so far. By adding the power of 2 curved surfaces we get. A thin lens in a continuous medium: n1=n2=n. Lensmaker equation: p=n/p + n/q= (nl-n)(1/r1 - 1/r2) For multiple lenses mtot= m1 + m2 + Special case: when an object is at infinity, the beams are coming in parallel rays onto the lens p=n/f. F = focal length (an intrinsic property for every lens) Therefore for a lens in air we use: A lens with a positive power aka converging lens converges light rays. A lens with a negative power aka diverging lens diverges light rays.
