Question

what is the formula of achromatic combination of lenses?​

Answer 1

The formula for an achromatic lens is w1/f1 + w2/f2

• The lens created by combining two different varieties of lenses with different focal power is known as an achromatic lens.
• The lenses are created in such a manner that the images which are made by the light are free of any aberration that is chromatic.
• In an achromatic lens the condition is Fr = Fv or 1/fr = 1/fv. on further simplifying we get w1/f1 + w2/f2