A ray of monochromatic light having a wavelength of 4.00 x 10-7 meter in air passes from air through Lucite and then into air again.
1)Calculate the frequency of light in air.
2)Identify the color of the light.

Explanation:

wavelength of light = 4 x 10⁻⁷ m

frequency = velocity in air / 4 x 10⁻⁷

= 3 x 10⁸ / 4 x 10⁻⁷

= .75 x 10¹⁵ Hz

= 75 x 10¹³ Hz.

Wave length = 4 x 10⁻⁷ m

= 400 x 10⁻⁹m

400 nm

colour of light having this wavelength in air is violet .  

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