1 Converging Lenses Biconvex lens Planoconvex lens Positive - - PDF document

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Lenses 2 types converging and diverging

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Converging Lenses rays that are parallel to the principal axis, strike the lens, and converge to a single point on the opposite side of the lens (they pass through 2 surfaces)

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Diverging Lenses rays that are parallel to the principal axis and diverge away from the focal point after they pass through the lens

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Converging Lenses Biconvex lens Planoconvex lens Positive meniscus lens

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Diverging Lenses Biconcave lens Planoconcave lens Negative meniscus lens

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Do handout: p 98, section 4.1 different types of lenses

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4.2 Refraction in lenses: What will happen when light passes through a prism? Draw a diagram

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Would you agree that the light would behave in a similar way with the biconvex lens?

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O F F'

Lines parallel to P will converge at F

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O F F' f if the rays are not coming parallel to P, they will converge on the focal plane at another point

(not to scale)

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O F F' f Terminology O F focal plane F' f Focal plane

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O F F' f Terminology O Optical centre = geometric centre F Principal focal point: incident rays parallel to C will converge focal plane F' Secondary focal point: symmetrical to F in relation to O f focal length distance of OF (and OF') Focal plane perpendicular to P, passes through F, where the incident rays will converge

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Terminology O Optical centre = geometric centre O F Principal focal point: incident rays parallel to C will converge F F' f focal plane

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Principal Rays of converging lenses = symbol for converging lenses

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O F F' f First principal ray

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O F F' f Second principal ray

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O F F' f Third principal ray

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O F F' f Three principal rays of a converging lens

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Diverging lens =

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Predict the path of light rays

Pull Pull

hint # 2

Pull Pull

hint # 1

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O F F' f

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O F F' f Diverging mirror First principal ray

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O F F' f Diverging mirror Second principal ray

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O F F' f Diverging mirror Third principal ray

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Text book page 105

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