The index of refraction is the ratio of the speed of light in a vacuum to the speed of light in a medium. Which true statement is based on this definition? Question 3 options:

Materials with a low index of refraction cause light to refract very little.

Materials with a low index of refraction cause light to refract a great deal.

Materials with a low index of refraction do not refract light.

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.