Question

2. How do you identify the focal point of
a Bi-convex lens? Explain with the help
of a diagram,​

Answer 1

Answer:

When light rays traveling in parallel are bent as they pass through a convex lens, they are bent toward, and thus become focused on, a common point on the opposite side of the lens. This point, F, is called the focal point, and the distance to F from the center of the lens, denoted f, is called the focal length

Answer 2

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.