?बिजली के तारों पर ये colourful balls क्यों .? | 1 minute facts | #shorts #facts

1. Write four facts of Panama Canal.

With respect to air critical angle in a medium for light of red colour [lambda_(1)] is theta . Other facts remaining same, critical angle for light of yellow colour [lambda_(2)] will be

With respect to air,critical angle in a medium for light of red colour [gamma_1] is theta . Other facts remaining same, critical angle for light of yellow colour [gamma_2] will be

There are four balls of different colours and four boxes of colours, same as those of the balls. The number of ways in which the balls, one in each box, could be placed such thast a ball does not go to a box of its own colour is: (A) |__4-1 (B) 9 (C) |__3+1 (D) none of these