Answer:
So electric field between the plates will be equal to 
Explanation:
We have given potential difference between accelerating plates = 24 KV = 24000 volt
Distance between the plates d = 1.5 cm = 0.015 m
We know that potential difference is given by V = Ed, here E is electric field and d is distance between plates
So 
E = 1600000 N/C = 
So electric field between plates will be equal to 
Transverse waves is what its called
Answer:
The critical angle for light is 41.81 degrees.
Explanation:
We have, light is propagating from a material with index of refraction of 1.50 to a material with index of refraction of 1. It is required to find the critical angle for light. It is angle for which the angle of refraction is equal to 90 degrees. It is given by :

So, the critical angle for light is 41.81 degrees.