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Minor Versionm

by Procheta Mallik


Make your own microscope using the material provided. Now place the leaf on the slide and the cover-slip over it. Observe the venation in the leaf and draw the structure as you see.

Video Overview

    • Be careful while handling the scissors and paper cutter or any other sharp tool.

    • Ensure the bead fits snugly in the hole so that it does not fall back into the eye while viewing through it.

  1. Using scissors, make a clean hole in the cardboard strip that is slightly smaller than the diameter of the bead.
    • Using scissors, make a clean hole in the cardboard strip that is slightly smaller than the diameter of the bead.

      • The hole created in the cardboard strip is slightly smaller in size so that the bead fits snugly in the hole.

    • Make a hole in the foam piece of the same size as that in the cardboard strip.

    • Use a non-transparent tape and make a hole in it of equal size to that in the foam piece, stick it on the foam, and then stick both of them to the cardboard strip, aligning all the holes.

    • Place the bead snugly in the hole and make sure it doesn't protrude too much from either side.

    • Make sure your hands are clean while handling the bead so that you don't stain the bead.

    • Cut a 2 cm x 2 cm square in the cardboard strip.

    • The size of the leaf should be more than the size of the cut potion of the cardboard strip.

    • Stick the leaf to a piece of transparent tape and only then mount it on the cardboard strip. Make sure the leaf covers the square hole in the cardboard strip completely.

    • Do some trial viewing first and finely adjust the distance between the object and the bead by moving the bead inside the hole.

    • Once the position for a clear image is achieved, use a rubber band to secure the microscope and object together.

    • Ensure that there is enough light falling on the object from behind so that you get a clear image.

    • Hover the bead microscope over different areas of the leaf to observe different types of venation.

    • Place different kinds of leaves, grasses etc as the object to observe different kinds of venation

    • The distance between the object and the bead is more than or less than the focal range of the bead.

    • Stray light coming from the periphery might hinder the clear view of the image.

    • Too many impurities/stains/marks on the surface of the object or the bead

    • Not enough light coming from behind the object.

    • Vary the distance between the glass bead and the object. Define the focal length of a lens. How are the images formed by keeping the object at differing distances from lens? Draw the respective ray diagrams.

    • Vary the distance between your eye and the bead. How does it affect the size of the image? What is the optimum distance between the eye and the lens?

    • Use an actual lens of the same diameter as the glass bead. Now what should be the distance between the object and the lens? Is it more than or less than in the case of the glass bead? What is the relation between the radius and focal length of the lens?

    • Use different kinds of leaves as the object. What are the different types of venation present in the leaves?

    • Using the same microscope, try viewing different objects like fingerprints on some transparent film or tape, pixels on the TV/computer/mobile phone screen etc.

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