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1. Monochromatic light is incident on a grating that is 81.0 mm wide and ruled with...

1. Monochromatic light is incident on a grating that is 81.0 mm wide and ruled with 21,000 lines. The second-order maximum is seen at 15.0°. What is the wavelength of the incident light in nm?

2. Light of wavelength 408.0 nm falls on a double-slit and the third order bright fringe is seen at an angle of 6.00°. What is the separation between the double slits in μm?

3. A light ray initially in water (n = 1.33) enters a transparent substance at an angle of incidence of 43.0°, and the transmitted ray is refracted at an angle of 25.5°. Find the refractive index of the substance.

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