Which lens type deviates light in more than one direction?

Which lens type deviates light in more than one direction?

• A. Bioconvex
• B. Plano convex
• C. Cylindrical lens
• D. Spherical lens

Answer: (C)

Light deviation depends on how the lens is curved across its surface. A spherical lens has curvature in all directions, so rays are bent toward the axis in more than one transverse direction. A cylindrical lens, on the other hand, is curved in only one meridian, so its bending power acts in a single plane while the perpendicular plane is essentially unaffected. In three-dimensional space this means you can describe deviations along two principal directions, but the lens’s refractive power is confined to one direction. If the question is asking which lens type bends light in more than one transverse direction, the usual correct characteristic would be a spherical lens, since its curvature exists in more than one meridian. A cylindrical lens fundamentally bends light along one plane, not multiple directions.

Light deviation depends on how the lens is curved across its surface. A spherical lens has curvature in all directions, so rays are bent toward the axis in more than one transverse direction. A cylindrical lens, on the other hand, is curved in only one meridian, so its bending power acts in a single plane while the perpendicular plane is essentially unaffected. In three-dimensional space this means you can describe deviations along two principal directions, but the lens’s refractive power is confined to one direction.

If the question is asking which lens type bends light in more than one transverse direction, the usual correct characteristic would be a spherical lens, since its curvature exists in more than one meridian. A cylindrical lens fundamentally bends light along one plane, not multiple directions.