Lenses
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Converging lense
Lens is thickest in the meddle and thinner at ends
Optical center
O Centre of the lens (perpendicular to principle axis)
Diverging lense
Lens is thicker at ends and thinner in middle Refracted rays must be extended back
Where are the Principal and secondary focus located on a diagram
Principle focus (F) Same side of the lens relative to incident rays Secondary focus (F’) Opposite side of the lens relative to the incident rays
Rules for converging lenses
• An incident ray that is parallel to the P. A. will refract through F • An incident ray that goes through O will go right through with no refraction • An incident ray through F’ refracts parallel to the P. A.
Rules for diverging lenses
• An incident ray that is parallel to the P. A. will refract as if originated from the F • An incident ray that is directed at F’ will refract parallel to the P. A. • An incident ray that goes through O will go right through with no refraction