Brianlest mark 19. Lens formula, which gives the relationship between the object-distance(u),
image-distance (v), and the focal length (f) of a spherical lens is
1/v + 1/u = 1/f
1/v + 1/f = 1/4
1/v - 1/0 = 1/f
1/v-1/u=f
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