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[enas1970]

· an incideent light ray falls on one side of a triangular prism by an angle 45 and emerges perpendicular on the other side . if you know that the refrective angle of prism equals 30 calculate the refractive index of its material

· give reasons for

the human being can not feel with atmospheric pressure

1. aquantity of gas its volume equals 5*10-4 m3 under pressure 70 CM.HG . ACALCULATE ITS VOLUME UNDER PRESSURE 140 CM.HG AT CONSTANT TEMPRATURE