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13. The relationship between the amplitudes of the electric field E and magnetic field of an electromagnetic wave E=cB, shows that the electric field amplitude Eis the magnetic field amplitude B A) much smaller than B) much greater than C) about equal to D) not enough info 14. The type of image formed by concave (converging) mirror in which the image can be projected is known as a image. A) virtual B) inverted C) real D) upright 15 Dispersion of light, which occurs when seeing the colors of a rainbow, happens because different wavelengths of light will experience slightly different A) angles of incidence B) Indices of retraction C) material thickness D) none of these 16. To correct nearsightedness a A) converging (convex) lens C) diverging (convex) mirror optical element must be used B) converging (concave) mirror D) diverging (concave) lens 17. The length of a telescope, as measured from the objective lens to the eyepiece, is equal to the A) observers near point distance B) difference of focal lengths of objective and eyepiece C) sum of the focal length of the objective and eyepiece D) observers far point distance 18. The far point is the A) greatest distance at which the eye can focus B) closest distance at which the eye can focus C) location of the focal point of the eye D) maximum distance at which a near sighted person can focus an image 19. A light ray that reflects from an interface with a material of higher index of refraction will experience a wavelength phase change Α) Ο B) C) D% 20. A rainbow occurs due to the dispersion of white light in a spherical drop of water and multiple A) reflections B) refractions C) A&B D) none of these