Question

How do you identify the focal point of a Bi-concave
lens? Explain with the help of a ray diagram.​

Answer 1

Answer:

Light rays entering a converging lens parallel to its axis cross one another at a single point on the opposite side. For a converging lens, the focal point is the point at which converging light rays cross; for a diverging lens, the focal point is the point from which diverging light rays appear to originate.