Will mark as brainliest if !
light passes straight from substance a into substance b without being refracted. what could the two substances be?
a. a could be water (speed of light = 225,000 km/s); b could be air (speed of light = 300,000 km/s).
b. a could be glass (speed of light = 200,000 km/s); b could be water (speed of light = 225,000 km/s).
c. a could be ruby (speed of light = 170,000 km/s); b could be sapphire (speed of light = 170,000 km/s).
d. a could be water (speed of light = 225,000 km/s); b could be diamond (speed of light = 120,000 km/s).

Anton created a chart listing different types of materials.which best complete the chart? (a)x: copper y: glass(b)x: rubber y: copper(c)x: paper y: silicon(d)x: silicon y: glass

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.