Applications Of Reflection Of Light
When a light ray (termed as the incident ray) hits a surface and bounces back (forms a reflected ray), the process of reflection of light has taken place.
Sign Convention for Mirrors
A mirror is made of glass that is coated with a metal amalgam on one side due to which the light ray incident on the surface undergoes reflection and not refraction.
A “floating strawberry” illusion can be produced by two parabolic
mirrors, each with a focal length of 7.5 cm, facing each
other so that their centers are 7.5 cm apart (Fig. P23.58). If
a strawberry is placed on the bottom mirror, an image of the
strawberry forms at the small opening at the center of the
top mirror. Show that the final image forms at that location
and describe its characteristics. Note: A flashlight beam shone
on these images has a very startling effect: Even at a glancing
angle, the incoming light beam is seemingly reflected off the
images of the strawberry! Do you understand why?
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