You send a beam of light from a material with index of refraction 1.21 into an unknown material. in order to identify this material, you determine its index of refraction by measuring the angles of incidence and refraction for which you find the values 41.9° and 37.3° , respectively. what is the index of refraction of the unknown material?

Which phrase describes the paleo-indians of prehistoric arkansas? a. grew cornb. lived in cliff dwellings c. crafted beautiful potteryd. hunted with stone-tipped spearswhich phrase describes native arkansas from the woodland traditiona. developed widespread agricultureb. hunted mastodon and woolly mammothc.built rectangle-shaped homesd. traded salt with other groups