Question

It is convenient to do the above experiment between 11:30 am and 1:30 pm instead of doing it in the morning at 8’O clock. Can you tell why?

Answer 1

At 8’O clock in the morning, the sunlight is not very bright. At the same time, the sun is on the horizon and the shadow would by very long. It would be extremely difficult to measure shadow in that case. 

Between 11:30 am and 1:30 pm, the sun is overhead and it would be easier to measure the length of shadow.