Shadow formation

  1. How should I place three objects for e.g three pencils so that no shadow is formed for them throughout the day(light source:sunlight to be considered)??
  2. jcsd
  3. Drakkith

    Staff: Mentor

    Off the top of my head I'd say make sure they point exactly at the sun. However, since the sun moves over the course of the day I can't see any way to make three stationary pencils create no shadow.
  4. A.T.

    A.T. 6,456
    Science Advisor
    Gold Member

    In the shadow of a larger object.
  5. But the image of first object will form and it will be visible and i am assuming all objects of equal size.

  6. What I was thinking was of an orientation in which light reflected from one object fall over the shadow of second object.Is it possible?
  7. Drakkith

    Staff: Mentor

    No. You might be able to accomplish something in a controlled lab environment using mirrors and such, but not with just a couple of pencils.
  8. Why not? 2nd pencil will reflect light and if i can make the light pass through shadow of 1st pencil the shadow will not form.

    I wish to find the angles at which i should place them so that no shadow is formed irrespective of position of sun.
  9. Drakkith

    Staff: Mentor

    A pencil is not reflective enough to do this.
  10. ok let us consider mirrors now how could it be done.
  11. Drakkith

    Staff: Mentor

    I don't know. I'm not sure you can, especially since you are keeping the mirrors/pencils stationary while the sun moves.
  12. davenn

    davenn 4,353
    Science Advisor
    Gold Member
    2014 Award

    you will still find that the reflected light is weaker than the direct sunlight on the first pencil
    and it is going to form a shadow but much weaker
    and the second pencil is still going to produce a shadow that isn't going to be "removed"

    I cannot see any way that it could be done short of what AT said
    "Putting the three pencils out of direct sunlight"

  13. Vanadium 50

    Vanadium 50 18,462
    Staff Emeritus
    Science Advisor
    Education Advisor

    Code (Text):

    printf("OP: How do you do this?"\n);
      printf("Others: you can't.\n");
      printf("OP: I think you can.  How?\n");
    Thread closed.
    1 person likes this.
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