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Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.

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Related Experiment Video

Updated: Jun 16, 2026

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
09:00

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

Published on: October 27, 2017

Lighting with sunlight using sun tracking concentrators.

M A Duguay, R M Edgar

    Applied Optics
    |February 20, 2010
    PubMed
    Summary

    This study explores using concentrated sunlight for interior building illumination, offering an economical solar energy solution. Dielectric mirrors separate light, enabling cool lighting and efficient energy generation from infrared rays.

    Area of Science:

    • Sustainable architecture
    • Renewable energy integration
    • Optical engineering

    Background:

    • Traditional lighting systems contribute significantly to building energy consumption.
    • Solar energy offers a sustainable alternative for powering buildings.
    • Efficiently channeling and utilizing solar energy for interior applications remains a challenge.

    Purpose of the Study:

    • To propose and evaluate a system for controlled sunlight delivery to interior building spaces.
    • To investigate the economic viability and practicality of solar-powered interior lighting.
    • To explore methods for optimizing light quality and energy harvesting from solar radiation.

    Main Methods:

    • Utilizing sun-tracking concentrators to direct sunlight into buildings.

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    Last Updated: Jun 16, 2026

    Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
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    Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

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  • Employing mirrors and lenses for internal light distribution.
  • Implementing dielectric mirrors to spectrally split solar radiation into visible and infrared (IR) components.

    • Main Results:

    • Demonstrated a method for channeling sunlight for interior illumination.
    • Showcased the potential for spectral splitting to provide cool lighting.
    • Indicated the feasibility of using separated IR radiation for electricity and heat generation via solar cells.

    Conclusions:

    • Controlled sunlight delivery presents an economically attractive and practical approach to building illumination.
    • Spectral splitting is key to achieving high-quality, cool interior lighting.
    • Integrated systems can simultaneously provide lighting and generate energy from solar radiation.