School and Work: units

Open Question: Finding units of degree?

A.) The index of refraction for a diamond for red light of wavelength 657 nm is 2.35, while that for blue light of wavelength 434 nm is 2.26. Suppose white light is incident on the diamond at 33.7 degree. Find the angle of refraction for red light. Answer in units of degree

B.) Find the angle of refraction for blue light. Answer in units of degree

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Open Question: do all motherboards detects and add hdd units pluged in the internal sata slot, after being turned on the pc?

suposse my pc is turned on and working normally, then i take a hdd and plug it in a internal sata conector on motherboard, and power cord too. after this do you think mobo will detect it as a new unit? just like an usb flash memory.

is this possible in all motherboards?

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$Open Question: how many more of other units fractions can be expressed as the sum of two different unit fractions?$