VECTOR PROBLEM Can you help me? p l e a s e

A force F, has an intensity of 40.0 N and points in a direction 20 ° below the positive x-axis. A second force F2 has an intensity of 75.0 N and points in a direction of 50 ° above the positive x-axis.
Using the vector sum method for components, determine the magnitude and direction of the resultant.

photocells convert light energy to electricity

where’s the list ? the question is incomplete

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.