One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.
The convex lens will form complete image of an object, even if its one half is
covered with black paper. It can be understood by the following two cases.
Case I
When the upper half of the lens is covered In this case, a ray of light coming
from the object will be refracted by the lower half of the lens. These rays meet
at the other side of the lens to form the image of the given object, as shown in
the following figure.
Case II
When the lower half of the lens is covered In this case, a ray of light
coming from the object is refracted by the upper half of the lens. These rays
meet at the other side of the lens to form the image of the given object, as
shown in the following figure.
