Question

please don't snap
it's urgent​

Answer 1

Answer:

annyong haseyo army how are you

Answer 2

Answer:

1) critical angle is optics, the greatest angle of incident beyond which rays of light passing through a medium off the surface of a less median is called as critical angle

2) median 1 (air )

median 2 (water )

3) the complete reflection of light where teaching on interface with the Les median when the angle of incident ray on the critical angle

4) value of 90°