Upside-down Shadows: An Interesting Phenomenon

You viewers are no stranger to the pin hole camera you might have studied in your 6th or 7th grade, where it inverts the upright image. The concept of convex and concave lens is also familiar to you. The image formed by convex lens is inverted and that formed by concave lens is upright. Inverted images are usually formed on the screen…(Ok, I’m going to far). Coming back to the topic, you’ve heard of and seen inverted images, but I bet you must have not seen your own shadow being inverted.

If images can be inverted, then shadows can surely(obviously) be inverted. And, I’m not joking. I’m going to explain it with a video proof which is below. But, before that, I will provide proof number 1: The theory proof(I know it’s boring).

Convex lens bends light, hence the image being inverted. So, if a convex lens(preferably your eye or your magnifying glass) and an object(Any object which has distinguishable ends) and light is arranged in a manner, we can create inverted shadows! Follow the procedure below and you can become a scientist for free!

Materials required: A dark room, source of light(Your mobile light would work), convex lens(your eye preferably, because that’s the best convex lens. Otherwise use magnifying lens), an object(Like a pen, which has different ends so that you can see clearly. Optional: 3 friends(If you cannot manage yourself)


  1. In a dark room, hold a magnifying glass and light in front of it. Shine the reflected light(I know a glass is transparent, but a not-so polished glass isn’t.), on a screen or wall. Let there be a slight 3 or 2 cm gap between the magnifying glass and the source of light
  2. Slowly, bring the object between the magnifying glass and the light.
  3. Adjust until you see the object being inverted on the wall.

Got confused? Diagram’s below(If you do not understand), see the video proof below the diagram.


So, basically, the light from the source travels to the object. The object  being opaque, shadow and the object’s light will be cast on the lens. Till now, the object’s image is upright. But, the light from the object travels and hits the lens. Of course, the lens being a glass material, will be mostly transparent, but we have chosen a dirty one(Don’t worry, most of the magnifying glasses are dirty), so that it is translucent. So, the reflected light of the object hits the screen, as you direct the light to the screen or wall. Adjust at different angles, until you will see an inverted image.(I know the diagram’s lame, so to save your time,  see the video below we made.

Proof no 2(Most anticipated one): The video proof


So, guys, that’s the video proof. If anything was not understood, let me know in the comments! Until then, stay alive and connected!

-Science geek


5 thoughts on “Upside-down Shadows: An Interesting Phenomenon

  1. Hi shreyas,i am sorry after many days i am speaking i think the video was so funny and i also think that your’e stammering is not there.You always said “okay guys” and ” um,um” more.And finally how was my funny blog.


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