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.

One-half of a convex lens is covered with a black paper. Will this len

1.	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» Solution :When one-HALF of a convex lens is covered with a black paper, this lens produces a complete image of the object. To prove it we perform an experiment as given below : TAKE a convex lens and cover half part of it by using a black paper. Place it vertically in a stand. On one side of it place a burning candle. On opposite side of the lens fix a WHITE screen as shown in Fig. Adjust the position of candle or screen till clear image of burning candle is formed on the screen. We observe that the image is a complete image of the object. From the EXPERIMENTAL observations, we find that image formation does not depend upon the sizeof a lens. A smaller lens can also form complete image of an object PLACED in front of it. However, brightness of the image decreases when some part of lens is blocked. It is because now lesser number of rays pass through the lens.