Chapter 1: Light - Reflection and Refraction

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Q
Light - Reflection and Reflection

Question:

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.

Answer:

A convex lens forms complete image of an object, even if its one half is covered with black paper. It can be explained by considering 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 given figure.


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