Introduction
Spherical mirrors, refraction, lenses, mirror/lens formulas, magnification, and power of lenses.
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Mirrors and Lenses
Concave mirror converges, convex diverges. R=2f. Mirror formula: 1/v+1/u=1/f. Refraction: Snell's law n1.sin(i)=n2.sin(r). Convex lens converges, concave diverges. Lens formula: 1/v-1/u=1/f. Power P=1/f dioptres.
Key Points
- •Mirror: 1/v+1/u=1/f; m=-v/u
- •Lens: 1/v-1/u=1/f; m=v/u
- •Power P=1/f (dioptre, f in metres)
- •Snell's law: n1.sin(i)=n2.sin(r)
- •R=2f for spherical mirrors
Quick Summary
- ✓Mirror: 1/v+1/u=1/f
- ✓Lens: 1/v-1/u=1/f
- ✓P=1/f dioptres; Snell's law for refraction
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Key Formulas
Mirror: 1/v+1/u=1/f; m=-v/u
Lens: 1/v-1/u=1/f; m=v/u
P=1/f; n=sin(i)/sin(r); R=2f
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