The figure below shows an example of the two-lens method of determining the focal length of a concave lens. The convex lens has a known focal length, while the concave lens has an unknown focal length. The real image formed by the first lens serves as the object for the second lens. Based on the image formed by this set-up, what is the focal length of the concave lens in cm? (HINT: Remember that the focal length of a concave lens is negative.) Round off your answer to ones place (whole number). 60 40 20 0. 2F -20 -40 -60 -80 -80 -60 -40 -20 40 60 80 100 120 20 2-

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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.