A plate of glass with parallel faces having a refractive index of 1.57 is resting on the surface of water in a tank. A ray of light coming from above in air makes an angle of incidence 38.5 ∘ with the normal to the top surface of the glass. (Figure 1) What angle (θsubscript3) does the ray refracted into the water make with the normal to the surface? Use 1.33 for the index of refraction of water.

Express your answer in degrees.

The “death throes” of stars are amongst the most complex phenomena in all of astronomy, and the “corpses” of stars amongst the most energetic and exotic objects in existence. beginning at the end of the core helium fusion stage in a star’s life, describe in detail the post-main sequence development of both (a) a 1.0 solar mass star, and (b) a 25.0 solar mass star. in what significant ways do they differ? what role does each of these types of stars play in the "star-gas-star" cycle and the evolution of chemical elements in our galaxy?

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Explain why you think this diagram shows what happened to the carbon in the biodome.