Self-Instruct
A concave lens is a type of lens that has a curved surface that is curved inward, like a cave. It is also known as a diverging lens because it causes light to diverge or spread out. A convex lens is a type of lens that has a curved surface that is curved outward, like a dome. It is also known as a converging lens because it causes light to converge or come together.
The difference between a concave and a convex lens is in the way they refract light. A concave lens bends light away from its center, while a convex lens bends light towards its center. This is why a concave lens is known as a diverging lens and a convex lens is known as a converging lens.
A concave lens is used to correct nearsightedness, while a convex lens is used to correct farsightedness. When a concave lens is placed in front of a person's eye, it causes the light to spread out and focus on the retina, which helps to correct nearsightedness. When a convex lens is placed in front of a person's eye, it causes the light to converge and focus on the retina, which helps to correct farsightedness.
Another difference between a concave and a convex lens is in their optical power. A concave lens has a negative optical power, while a convex lens has a positive optical power. This means that a concave lens is weaker than a convex lens.
In summary, the difference between a concave and a convex lens is in the way they refract light, their use in correcting vision, and their optical power. A concave lens bends light away from its center, is used to correct nearsightedness, and has a negative optical power. A convex lens bends light towards its center, is used to correct farsightedness, and has a positive optical power.