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Glossary Total Internal Reflection

light reflects entirely within a medium at a critical angle

Total Internal Reflection (TIR) occurs when a light wave traveling through a medium with a higher refractive index (like water or glass) hits the boundary of a medium with a lower refractive index (like air) at an angle greater than the critical angle, causing the light to be completely reflected back into the original medium rather than refracting through the boundary. This phenomenon is crucial in fiber optics, where it allows light to be efficiently transmitted over long distances with minimal loss.

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Analyzing the Laser-Light Reflection from Human Hair Fibers Part 1: Light Components Underlying the Goniophotometric Curves and Fiber Cuticle Angles

research Analyzing the laser-light reflection from human hair fibers Part1: Light components underlying the goniophotometric curves and fiber cuticle angles

January 2003 in “Research Portal (King's College London)”

This study employed a laser-based method to analyze how light reflection patterns vary on human hair fibers, revealing changes related to hair color and the tilt of the cuticle cells.

research Light scattering from human hair fibers

161 citations , July 2003 in “ACM Transactions on Graphics”

In this study, a new shading model for hair was developed that better matches real-life light scattering, thanks to detailed new measurements of hair fiber scattering not predicted by existing models.

research Light scattering from human hair fibers

90 citations , July 2003

This study introduced a new hair shading model that more accurately simulates light scattering on hair fibers, capturing effects not predicted by previous models.

research Studies of light scattering from ethnic hair fibers

7 citations , July 2004 in “International Journal of Cosmetic Science”

Different hair types from various ethnic groups affect hair shine due to characteristics like thickness and shape.

research Investigation of hair dye deposition, hair color loss, and hair damage during multiple oxidative dyeing and shampooing cycles.

4 citations , August 2016 in “PubMed”

This study analyzed how oxidative hair dye leaches from pigmented and nonpigmented hair during wash cycles, finding that melanin influences the dye deposition and leaching processes.

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community Why the Brain Resists Updating Your Appearance: The Neuroscience Behind “It Happened Overnight”

6 upvotes 7 months ago

The brain resists updating its perception of gradual appearance changes, like hair loss, due to its preference for stability and reliance on an internal model. This delay in perception can make changes feel sudden once the brain finally updates its model.

community The pessimism about the Crisp Cas 9 is excessive

12 upvotes 11 months ago

CRISPR Cas9 could potentially treat baldness by targeting specific genes in hair follicles without affecting other body functions. There is optimism about its future use, despite ethical concerns and the current reliance on treatments like minoxidil and finasteride.

community Why isn't anyone using Way-316606? If it works then it grows a full head of hair back on most people

in Treatment 134 upvotes 1 year ago

Way-316606 is considered a potential hair loss treatment but is avoided due to safety concerns and lack of research. Minoxidil and Finasteride are preferred as established treatments.

community People treat me so different when I was bald compared to my comb over.

in Chat 226 upvotes 1 year ago

The user feels treated better with a comb-over than when bald due to cancer. They are considering a hair transplant and using finasteride and minoxidil for hair loss.

community Thoughts on Bryan Johnson’s new hair loss product?

143 upvotes 11 months ago

Bryan Johnson's new hair loss product, which includes peptides, is viewed skeptically by many, with concerns it may be a money grab rather than an effective treatment. Most users prefer proven treatments like finasteride and minoxidil, which are cheaper and have established results.

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learn Epidermal Growth Factor

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