Answer :

An optical shop consists of different lenses according to the eye problem a patient has. Like a myopic patient uses a concave lens while a patient suffering from hypermetropia uses convex lens. Old aged people used bifocal lens and so on. People prescribed a sphere and a cylinder prescription have astigmatism of the eye and can be given atoric to correct it.So the following lists include all the types of lenses available in an optical shop:

• Plano convex lens


• Double convex lens


• Plano concave lens


• Double concave lens


• Cylindrical lens


• Achromatic lens


• Aspheric lens


• IR lens


• UV lens


• Atoric lens


The SI unit of power is diopter (D). 1 D lens focuses rays of light at a distance of 1 metre. Thus the focal length of such lens is 1 metre (100 cm). So if power is given then focal length will be:



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