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Related Concept Videos

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...
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

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Related Experiment Video

Updated: Jun 22, 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

Cemented doublet lens with an extended focal depth.

Xinping Liu, Xianyang Cai, Shoude Chang

    Optics Express
    |June 3, 2009
    PubMed
    Summary

    This study introduces a novel cemented doublet lens design for extended focal depth. This innovative optical system achieves significantly improved focal depth while maintaining high resolution, offering a 1.5x increase over conventional lenses.

    Area of Science:

    • Optics
    • Materials Science
    • Optical Engineering

    Background:

    • Conventional lenses have limitations in achieving extended focal depth without compromising resolution.
    • Designing imaging systems with both large focal depth and high resolution is a persistent challenge in optical engineering.

    Purpose of the Study:

    • To investigate a novel method for designing lenses with an extended focal depth.
    • To develop a cemented doublet lens combining birefringent and conventional lens elements.
    • To analyze the performance of this new lens design in terms of focal depth and resolution.

    Main Methods:

    • Designing a cemented doublet lens comprising a birefringent lens and a conventional lens.
    • Orienting the crystal optical axis of the birefringent lens perpendicular to the optical system axis.

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    Last Updated: Jun 22, 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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    Published on: October 27, 2017

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  • Selecting and optimizing parameters for both lens elements to achieve desired imaging characteristics.

    • Main Results:

    • A flexible imaging system design capable of simultaneously achieving large focal depth and high resolution was configured.
    • Theoretical analysis demonstrated that the designed lens offers an extended focal depth approximately 1.5 times that of a conventional lens.
    • The proposed method allows for precise control over imaging system parameters.

    Conclusions:

    • The cemented doublet lens design utilizing a birefringent element offers a viable solution for extended focal depth imaging.
    • This approach provides a tunable method for enhancing the performance of optical systems.
    • The findings contribute to advancements in optical design for applications requiring large depth of field and high image quality.