The objective lens and the eyepiece lens of a telescope are 0.60 m apart. the telescope has an angular magnification of 25. what is the focal length of the eyepiece?

Asample of a gaseous substance changes into a liquid

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?