Question: please please help with these I'm so stuck on it and really need help right now!!!PHYSICS 30 HELP 7. An object is 15.8 cm from

please please help with these I'm so stuck on it and really need help right now!!!PHYSICS 30 HELP

7. An object is 15.8 cm from a converging mirror with a focal length of 10.9 cm. The image will appear cm from the mirror. (Record your three digit answer.) Your answer: 13. The refractive index of ruby is 1.76 and 1.33 for water. The critical angle for a ruby-water boundary is degrees. (Record your three-digit answer.) Your answers 12. A beam of light traveling in air enters a glass block at 56.0. If the angle of refraction is 22.0', the index of refraction of the glass is (Record your three digit answer.) Your answer: 4. A beam of light moving through air strikes the surface of a crystal (n = 2.65). If the wavelength of light in the crystal is 623 nm, the frequency of the light in the air, expressed in scientific notation, is a.b x 10"d Hz. The values of a, b, c, and d are . (Record your four digit answer)

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