Introduction:
When light travels from one medium to another, its speed changes due to the change in the refractive index of the medium. In this case, light is traveling from air to glass, and we need to find its speed in the glass.

Refractive Index:
Refractive index is the measure of how much a material can bend light. It is defined as the ratio of the speed of light in vacuum to the speed of light in the material. Mathematically, it can be expressed as:

Refractive index (n) = Speed of light in vacuum / Speed of light in material

Calculating Speed of Light in Glass:
Given that the refractive index of glass is 1.50, we can use the above formula to calculate the speed of light in glass.

n = c / v

where n is the refractive index, c is the speed of light in vacuum, and v is the speed of light in the material (in this case, glass).

Substituting the values, we get:

1.50 = 3 x 10^8 / v

v = 3 x 10^8 / 1.50

v = 2 x 10^8 ms^-1

Therefore, the speed of light in glass is 2 x 10^8 ms^-1.

Explanation:
When light travels from one medium to another, its speed changes due to the change in the refractive index of the medium. Refractive index is the measure of how much a material can bend light. In this case, light is traveling from air to glass, and we need to find its speed in the glass. The refractive index of glass is 1.50, and we can use the formula n = c/v to calculate the speed of light in glass. Substituting the values, we get the speed of light in glass as 2 x 10^8 ms^-1.