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    Area of Science:

    • Physics
    • Optics
    • Fluid Dynamics

    Background:

    • Floating objects cast shadows on water surfaces.
    • Meniscus effects, caused by surface tension, alter light refraction.
    • These effects distort shadow shapes, making them deviate from object boundaries.

    Purpose of the Study:

    • To develop a theoretical model for light intensity in water shadows.
    • To investigate the impact of water depth on shadow morphology.
    • To compare theoretical predictions with experimental and simulation results.

    Main Methods:

    • Developed an approximate theoretical model for light intensity.
    • Conducted laboratory experiments with floating objects.
    • Performed computer simulations to validate calculations.

    Main Results:

    • Meniscus effects can either brighten or extend the dark shadow area.
    • A minimum water depth of approximately 10 cm is required for caustic structures to form.
    • Shadows closely match object outlines in shallow water (<10 cm).
    • Shadows significantly deviate from object outlines in deeper water (>10 cm).

    Conclusions:

    • Water depth is a critical factor in determining the shape of shadows cast by floating objects.
    • Meniscus-induced light refraction leads to complex shadow patterns, especially at depths around 10 cm.
    • The study provides a framework for understanding and predicting these optical phenomena in natural settings.