A parallel beam of light makes an angle 30º with the surface of a glass plate having refractive index of 1.50. (a) What is the angle between the refracted beam and the surface of the glass? (b) What should be the angle of incidence φ with this plate for the angle of refraction φ/2 ?

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2