some ugly definitions Flashcards

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1
Q

principle axis

A

is the line joining the 2 centres of curvature

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2
Q

optical center

A

`the point on the principal axis through which a ray of light may pass undeviated

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3
Q

principal focus

A

all rays that are parallel to the principal axis are refracted such that they pass or appear to pass through a point on the principal axis called the principal focus

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4
Q

focal length

A

the distance between the optical centre and the principal focus

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5
Q

how many foci does a convergent beam have

A

two; object and image focus

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