# Question

(a) Use ray diagrams to show that a ray parallel to the optic axis of a biconvex lens is refracted toward the axis at the incident surface and again at the exit surface.

(b) Show that this also holds for a biconcave lens, but with both refractions pointing away from the axis.

(b) Show that this also holds for a biconcave lens, but with both refractions pointing away from the axis.

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