Question

Riya and Priya were sitting around a round table. They noticed that they could see their own and each other’s image onto the table top. Then table top is made up of
A. Unpolished wood, covered with white cloth.
B. Polished glass of red colour.
C. Glass covered with cellophane paper.
D. Smoked glass covered with green colour cloth.

Answer 1

Hint: Images are formed when light reflected from an object enters into our eyes. The whole light is reflected when the surface is smooth and shiny.

Complete Step-by-Step solution:
Formation of images:
We see an object when light falling on it reflects and enters into our eyes. The image is formed on a surface when it reflects most of the light falling on it. Most images are formed on shiny and smooth surfaces such as metals and mirrors. When a glass is perfectly polished with any colour such as red it gets smooth and shiny, so the whole light falling on it gets reflected back.
Now when Riya and Priya were sitting around a round table, the light falling on them got reflected in all directions. The light reflected from them falls on the table, as the table is polished it reflects back all the light falling on it. This reflected light from the table enters into their eye and hence they could see each other’s images on top of the table.
Correct option is B. Polished glass of red colour.

Note: Note that we can image formed only when the light reflected from that object enters into our eyes. It happens many times that a person close to us can see an image formed but we can’t see it. This is because the light will be reflected in all directions when it falls on a smooth surface. They only get reflected in particular directions depending on the direction of incident of light rays.