Convex mirror is used as rear view mirror in vehicles. Because the image is smaller, more image can fit onto the mirror, so a convex mirror provides for a larger field of view than a plane mirror. This is why they are useful.
The one way how the progressives differed from populists is the populists are almost farmers whereas the progressives are typicaly middle class people who lives in the cities.
Rajatarangini is a historical chronicle of the north - western Indian subcontinent, particularly the kings of Kashmir and was written in Sanskrit by Kashmiri historian Kalhana in the 12th century CE.
A sentence has been given in Direct/Indirect Speech. Out of the four given alternatives, select the one which best expresses the same sentence in Indirect/Direct Speech.