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Related Concept Videos

Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Related Experiment Video

Updated: Jun 12, 2026

In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for Cu(In,Ga)Se2 Solar Cells
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Solar eclipse observation: some simple devices.

A Handojo

    Applied Optics
    |June 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Evaluating solar irradiance for safe solar eclipse observation, this study proposes simple, effective devices like pinhole cameras and periscopes to protect the retina from blue light hazards.

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    Published on: October 27, 2017

    Area of Science:

    • Optics and Photonics
    • Ophthalmology
    • Solar Physics

    Background:

    • Terrestrial solar irradiance poses risks to the retina due to absorbed energy and blue light.
    • Assessing solar irradiance is crucial for establishing safety standards for observing solar eclipses.
    • Existing observation methods may not adequately address retinal safety concerns.

    Purpose of the Study:

    • To evaluate terrestrial solar irradiance concerning retinal energy absorption and blue light hazard.
    • To compare evaluated irradiance with established safety standards for solar eclipse observation devices.
    • To propose simple, safe, and effective devices for solar eclipse observation.

    Main Methods:

    • Calculation of terrestrial solar irradiance, considering retinal energy absorption and blue light exposure.
    • Comparison of calculated irradiance values against established international safety standards.
    • Design and conceptualization of simple solar eclipse observation devices.

    Main Results:

    • The evaluated solar irradiance necessitates specific safety requirements for solar eclipse observation devices.
    • Proposed devices include a folded pinhole camera, a pinhole projector, and a multimirror periscope.
    • The multimirror periscope offers sharper solar imaging compared to pinhole cameras.

    Conclusions:

    • Simple devices can meet the safety requirements for solar eclipse observation.
    • Pinhole cameras and projectors provide accessible means for indirect solar viewing.
    • A compact multimirror periscope enhances image clarity for safer solar observation.