Question

TV signals broadcast by Delhi Studio cannot be directly received at Patna which is almost 1000 km away. But the same signal goes some 36000 km away to a satellite, gets reflected and is then received at Patna. Explain. 

Answer 1

TV signals are electromagnetic waves just like light waves. Hence it travels in a straight line. Due to the curvature of the earth, the TV signals broadcast by Delhi Studio get obstructed on the way to Patna. Hence it cannot be directly received at Patna. 

But the same signal can be received by satellite and re-broadcasted which can be received at Patna. Because there is no obstruction in the straight path of the signals.