he index of refraction of crown glass is 1.53 for violet light, and it is 1.51 for red light.

(a) What is the speed of violet light in crown glass?
(b) What is the speed of red light in crown glass?

To find the speed of light in a medium, you can use the formula:

speed of light in a medium = speed of light in a vacuum / index of refraction

(a) To find the speed of violet light in crown glass, we use the index of refraction of 1.53:

speed of violet light in crown glass = speed of light in a vacuum / 1.53

(b) Similarly, for red light, we use the index of refraction of 1.51:

speed of red light in crown glass = speed of light in a vacuum / 1.51

To calculate the speeds, you need to know the speed of light in a vacuum, which is approximately 3 × 10^8 meters per second (m/s). Now you can substitute the values and solve for the speeds in crown glass:

(a) speed of violet light in crown glass = (3 × 10^8 m/s) / 1.53
(b) speed of red light in crown glass = (3 × 10^8 m/s) / 1.51

To answer these questions, we can use the formula that relates the speed of light in a medium to the index of refraction:

Speed of light in a medium = Speed of light in a vacuum / Index of refraction

(a) To find the speed of violet light in crown glass, we can use the index of refraction for violet light, which is 1.53.

Speed of violet light in crown glass = Speed of light in a vacuum / Index of refraction for violet light
Speed of violet light in crown glass = 3 x 10^8 m/s / 1.53
Speed of violet light in crown glass ≈ 1.96 x 10^8 m/s

Therefore, the speed of violet light in crown glass is approximately 1.96 x 10^8 m/s.

(b) To find the speed of red light in crown glass, we can use the index of refraction for red light, which is 1.51.

Speed of red light in crown glass = Speed of light in a vacuum / Index of refraction for red light
Speed of red light in crown glass = 3 x 10^8 m/s / 1.51
Speed of red light in crown glass ≈ 1.99 x 10^8 m/s

Therefore, the speed of red light in crown glass is approximately 1.99 x 10^8 m/s.

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