Answer:
The transmission of light across a boundary between two media is accompanied by a change in both the speed and wavelength of the wave. ... As long as the light wave changes speed and approaches the boundary at an angle, refraction is observedFor a plane mirror, the image will be the same size as the object and will be the same distance behind the mirror as the object is in front of the mirror. Since the light forming the image does not pass through the image, it is called a virtual imageWhen light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction. When light enters a more dense substance (higher refractive index), it 'bends' more towards the normal line.We do a thought experiment. We light with a flashlight against an air bubble in water. In the figure below, draw the continued path of the rays through the air bubble and out into the water. Justify why you drew as you did but you do not need to do any calculations.
