Question

name the phenomenon of light on which working of a lens is based?​

Answer 1

Answer:

In may 1954,Roger bannister became the first person to run a mile in less than four minutes.he ran the four LaPs of the race in 57.5,60.7,62.3,58.9 seconds.what was his total time?by how much did he break the four minute barrier.

itz Ananya