It is to get the idea to know about the design or technique of a product. Here the lead pen is used for that.

2.  Reverse engineering is taking apart an object to see
how it works in order to duplicate or enhance the
object.
 The practice, taken from older industries, is now
frequently used on computer hardware and software.
DEFENITION

4.  Remove the back cap and eraser.

5.  Remove the front tip

6.  Hallow body and gripper.

7.  Pocket clip and eraser holder.

8.  Refill with spring system for lead.

11. Finally we got the idea about the design of
LED PEN with the help of reverse
engineering.

12. THANK YOU