Light from a laser pointer is goes through a window composed of crown glass, which has an index of refraction of 1.523. What is the speed of the light while it is in the window glass

1.97 * 10^8 m/s

Explanation:

Parameters given:

Refractive index, n = 1.523

Refractive index is the ratio of the speed of light in a vacuum to the speed of light in a specified medium.

When the medium is glass, the refractive index is given as:

n = Vv/Vg

Where Vv = velocity of light in a vacuum

Vg = velocity of light in glass

The velocity of light in a vacuum is 3 * 10^8 m/s. Therefore,

1.523 = (3 * 10^8)/Vg

Vg = (3 * 10^8)/1.523

Vg = 1.97 * 10^8 m/s

from 1609, galileo galilei used the recently invented telescope to observe the sun, moon and planets. he saw the mountains and craters of the moon, and for the first time revealed the planets to be worlds in their own right. galileo also provided strong observational evidence that planets orbited the sun.

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a longitudinal wave moves energy that is to the direction of the wave’s movement. - true