Refraction is the change in the direction of the wave passing from one medium to another.
The change in the direction of the propagation of any wave is due to the different speed at different points.
A far away object appears closer and a small object appears larger.
Take an example. Suppose, an object lies in water.
A far away object appears closer. The angle from which the rays of light reach the observer is larger than the angle that it makes in air.
This makes the angular size larger to the observer's eye which makes the object look larger relative what it looks in air. Similar but vice versa condition occurs in the case when a small object appears larger.
It is mosque. I know, because I'm muslim. :)
One way that the Romans were able to create larger interior spaces in their architecture than the Greeks is by the use of concrete, which is lighter, stronger, and less expensive than marble. The Romans also became very skilled at the construction of bricks, which are also stronger and less expensive than marble.
Because concrete is lighter than marble, concrete buildings do not require as much interior support (e.g., columns) to hold them up. Fewer columns or interior support structures mean more interior space.
I got this information from: https://www.enotes.com/homework-help/why-were-romans-able-create-larger-interior-spaces-445813
I hope I helped:)
