A ray diagram is shown
ns
What does ©Koub>2ß> represent?
a
O
b
angle of reflection
in angle of refraction
in index of reflection
index of refraction
Od
Help please

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.