Table. 1. Table 1

Meaning of signs used by Newton.

Signs	Meaning of signs
b	focus of refracting surface
ca	incident ray
ag	refracted ray
bg¯	distance between foci
qa	normal at b
qr, qh	perpendicular line drawn from q to the incident ray and refracted ray
bg¯=a′,bq¯=v,ab¯=x,ag¯=y

New Phys.: Sae Mulli 2023;73:530~540 https://doi.org/10.3938/NPSM.73.530

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