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 ?

answer: b.

explanation:

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

the answer for apex is the lowest

e/c, where e is its total energy