Question

Two different types of lenses are placed on a sheet of newspaper. How will you identify them without touching?

Answer 1

Hint:The lens showing a bigger view of the words in the newspaper is convex and the lens showing smaller view or the same size of the words is concave lens.


Complete Step by step solution:

Without touch we can identify two different lenses by looking at the size of the newspaper letters under the lens.
If the image of the letters is large then it is a convex lens because the convex lens produces a larger image. If the image of the letters is smaller than the letters then it is a concave lens because the concave lens produces a lower image.

Additional Information:The classification of the lens depends on how the light rays bend as they pass through the lens. There are two main types of lenses:
Concave Lenses
Convex Lenses
Convex lenses are thick in the middle and thin at the edges. The concave lens is flat in the middle and thick at the edges. Convex lenses are also known as convergent lenses, because the rays of light are inclined inward and located at a point known as the focal length. On the other hand, the concave lens is also known as a deviation lens because it bends the external rays of light parallel and bends them at the focal point.

Notes:A lens is a transmitting optical device that focuses or spreads light rays through refraction. Ordinary lenses consist of a piece of transparent material, and many simple lenses, arranged together on a common axis by a combined lens. A lens can focus light to create an image, unlike a prism, because it refracts light without focusing.