Assignment:
1. How long does it take for the light to reach the earth from the sun?
2. What are the wavelengths of the following radio stations:
a) 90 MHz and
b) 790 KHz ?
3. What is the frequency of light at 600nm? What is the wavelength of radiation at 3x10" Hz?
4. What is the grating spacing (d) for a diffraction grating with 15.000 lines per inch? At what angle will light at 585nm be diffracted?
5. A light beam strikes the surface of the water at 30° from normal. What are the angles of reflection and refraction if the index of refraction is 1.33 for water?
6. What is the focal length for a thin double convex lens if the image appears at 10 cm when the object is located at 1 m from the lens?
7. What is light, or how is light created? (Hint 1 : think of several ways in which you would produce light. Hint 2 : what is this production of light always associated with?)