Question

power of a lens is found to be +2.5 diopter. what kind of lens is it?

Answer 1

Answer:

we know that power P=2.5D

P=

f

1

f=

2.5

1

=0.4m=40cm

Since the focal length of lens is positive so it is a convex lens. It is a converging lens.

Answer 2

Answer:

Convex Lens or Converging Lens

Explanation:

Power + 2.5 D means it is the power of the convex lens.

Lens

A lens is a transmitting optical device that focuses or disperses light rays by refraction. Simple lenses consist of a single transparent material, while compound lenses consist of several simple lenses arranged along a common axis. A lens can focus light to form an image, unlike a prism which refracts light without focusing.

There are two type of lens which are as follows:

• Convex or Converging Lens: A convex lens is a lens that focuses light rays traveling parallel to its main axis (i.e., focuses the incoming rays in the direction of the main axis), which is relatively thick in the middle and thin at the lower and upper edges. The edges are curved outward rather than inward.
• Concave or Diverging Lens: A concave lens is a lens that splits a direct ray of light from a source into a reduced vertical virtual image. It can form both real and virtual images.

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