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GlossaryTotal 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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research Light Scattering from Human Hair Fibers

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

Researchers developed a new model for more realistic computer graphics rendering of hair by considering how light scatters on hair fibers.

research Light Scattering from Human Hair Fibers

90 citations, July 2003

Researchers developed a new model for more realistic computer graphics of hair by considering how light scatters on hair fibers.

research Attenuated Total Reflection Fourier Transform Infrared Spectroscopy Analysis of Human Hair Fiber Structure

19 citations, May 2008 in “Applied spectroscopy”

Human hair has different protein structures in its cuticle and cortex.

research Fourier Transform Infrared Attenuated Total Reflection Analysis of Human Hair: Comparison of Hair from Breast Cancer Patients with Hair from Healthy Subjects

42 citations, January 2005 in “Applied spectroscopy”

Hair from breast cancer patients shows changes in structure and composition, and a test using these changes detected cancer but also falsely identified some healthy samples as cancerous.

research Detection Of Breast Cancer Using ATR-FT-IR Spectroscopy On Single Hair Fibers

16 citations, December 2016 in “ecancermedicalscience”

Hair analysis may help detect breast cancer early by identifying changes in lipid content.

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

in Chat 226 upvotes 3 months 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 hairloss in my 20s has ruined my life.

in Research/Science 373 upvotes 2 months ago

A person in their 20s is struggling with hair loss, using treatments like minoxidil and finasteride. Suggestions include self-improvement, therapy, hair transplants, and focusing on acceptance and confidence.

community Balding, short, small penis. What is the point of living…

in Treatment 405 upvotes 3 years ago

A 24 year old male struggling with the physical and mental effects of balding, being short, and having a micropenis. Suggested treatments include taking medications such as finasteride and minoxidil, lifting weights, and trying not to compare himself to others.

community Embraced baldness. Time to leave this subreddit

in Chat 882 upvotes 5 months ago

A user shared their positive experience of embracing baldness after years of trying treatments like Minoxidil and finasteride. They found happiness and confidence by shaving their head, despite some social challenges, and encouraged others to focus on their attitude and seek therapy if needed.

community Hairline recovery after severe hair loss

in Progress Pictures 88 upvotes 2 years ago

A user's hairline recovery after severe hair loss, which was treated with Dutasteride and Minoxidil; other users offered their opinions on the severity of the hair loss.

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