Convex Lens

Introduction:

Convex lens is the most seen lens and it is widely used for many purposes and it is one of the types of simple lenses.

What is lens?

Lens is an optical device which will refract the light rays in two aspects either in diverging manner or in converging manner.

What type of lens is convex?

Convex lens is also called as converging lens and sometimes it is called as positive meniscus lens. To study about the convex lens in detail, we have to study the properties of convex lens. They are:

• Principal axis:
  The straight line drawn from the mid-point of the lens in both directions.
• Focal point:
  In convex lens, all the light rays passes through them converge at a single point. This particular point is called focal point.
• Focal length:
  The distance between the midpoint of the convex lens and the focal point is measured as focal length of convex lens.

Lens equation:

This is the equation which helps to find the position and the nature of the image formed by an object. Such formula is

1/u + 1/v = 1/f

Here,

'u' represents the distance between the object and the lens,

'v' represents the distance between the image and the lens,

'f' represents the focal length of the convex lens.

In convex lens, the object distance, image distance and focal length are in positive. By keeping the object at different positions, the position and nature of the image will alter.