6-10 Optical Filters and Their Properties Quiz

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which type of filter transmits wavelengths in a narrow range around a specified wavelength?

Band pass filter (correct)

Long pass filter

Short pass filter

Absorbance filter

What is the primary function of optical filters?

To absorb all wavelengths of light

To create multiple components with differing wavelengths

To reflect all wavelengths of light

To transmit only the desired wavelengths (correct)

Which type of filter transmits wavelengths above a cut-on wavelength?

Absorbance filter

Short pass filter

Long pass filter (correct)

Band pass filter

What is the composition of interference filters like dichroic, dielectric, and reflective filters?

Composed of multiple thin layers of dielectric material on transparent substrate Signup and view all the answers

What is the function of absorbance filters like color glass filters?

Absorb the unwanted wavelengths Signup and view all the answers

What property of light is responsible for its refraction when it meets a new material at an angle other than perpendicular?

Index of refraction Signup and view all the answers

In the context of medicine, what property of light is used to detect porphyria?

Fluorescence Signup and view all the answers

When a light photon is absorbed and its energy is used to cause a chemical change in a molecule, which property of light is being demonstrated?

Absorption and energy transformation Signup and view all the answers

What use of visible light in medicine involves obtaining visual information about the patient's skin and the presence of abnormal structures?

Visual examination Signup and view all the answers

What property of light is used to heat tissues in medical applications?

Absorption and energy transformation Signup and view all the answers

What is the term used to describe the range of NIR photons that cells in the human body are most sensitive to?

Therapeutic or biological window Signup and view all the answers

Why can LED, OLED, and CFL lighting and displays be referred to as 'Visible Only' emitters?

They emit visible photons but no NIR photons Signup and view all the answers

Why is it incorrect to compare the spectrum of Visible Only emitters to natural sunlight based solely on the spectrum of the Sun?

The human body absorbs more NIR photons under natural sunlight Signup and view all the answers

What do the models show about how the human body responds to UV and HEV photons in sensitive areas like the retina?

The body filters out UV, attenuates VIS, and gathers NIR photons Signup and view all the answers

Why are larger amounts of NIR photons exposed to 100% of the cells in the fetus and young children compared to approximately 60% of the cells in adults?

The optical penetration depth of photons is higher in children Signup and view all the answers

What is the primary function of optical filters in the context of the human body's response to sunlight?

To selectively absorb certain wavelengths of light to modulate circadian rhythms Signup and view all the answers

Which property of the solar spectrum triggers the stimulation of the pineal gland to secrete circulatory melatonin, according to chronobiologists?

Violet, blue, and green photons Signup and view all the answers

What is the role of modern Visible Only lighting (VOL) systems during the day, based on the information provided?

To have high blue content to make people more alert and suppress circulatory melatonin Signup and view all the answers

Based on the information provided, what is the effect of exposure to the narrow range of wavelengths corresponding to the blue of the sky on circadian rhythms?

It suppresses circulatory melatonin and makes people more alert Signup and view all the answers

What is the significance of the circulatory melatonin levels and existing circadian rhythms with respect to sunlight exposure, based on the information provided?

They depend on only approximately 2% of the spectrum emitted by the Sun Signup and view all the answers

Study Notes

Optical Filters

Bandpass filters transmit wavelengths in a narrow range around a specified wavelength.
The primary function of optical filters is to selectively transmit or block specific wavelengths of light.
Long-pass filters transmit wavelengths above a designated cut-on wavelength.

Filter Composition

Interference filters, such as dichroic, dielectric, and reflective filters, consist of multiple thin layers of materials that create interference effects to selectively transmit light.
Absorbance filters, like color glass filters, function by absorbing certain wavelengths and allowing others to pass.

Properties of Light in Medicine

Refraction occurs due to the change in speed of light when it meets a new material at an angle other than perpendicular.
In medicine, the detection of porphyria utilizes the property of light absorption in biological samples.
Chemical changes in molecules due to absorbed photon energy demonstrate the property of light related to energy transfer.

Medical Use of Light

Visible light helps obtain visual information about a patient's skin and detect abnormal structures.
The heating of tissues in medical applications is attributed to the property of light absorption.

NIR Photons and Light Emission

Cells in the human body are most sensitive to a specific range of near-infrared (NIR) photons.
LED, OLED, and CFL lighting and displays are referred to as 'Visible Only' emitters as they primarily emit visible light without significant infrared or ultraviolet components.
Comparing the spectrum of 'Visible Only' emitters to natural sunlight based solely on the spectrum of the Sun is misleading, as natural sunlight also comprises infrared and ultraviolet light.

Human Body Response to Light

Studies suggest that the human body responds differently to UV and high-energy visible (HEV) photons, noting sensitivity in areas like the retina.
Fetus and young child cells are exposed to larger amounts of NIR photons compared to adult cells, which receive around 60% of NIR exposure.

Circadian Rhythms and Melatonin

The primary function of optical filters in relation to sunlight exposure is to alter the body's response to light, helping regulate biological rhythms.
Chronobiologists assert that specific properties of the solar spectrum, particularly blue light, stimulate the pineal gland to secrete circulating melatonin.
Modern Visible Only lighting systems play a role during the day in managing light exposure, potentially influencing circadian rhythms.
Exposure to wavelengths that correspond to the blue of the sky can affect circadian rhythms by promoting wakefulness and alertness.

Sunlight Exposure Effects

Circulating melatonin levels are significant in their regulatory role on existing circadian rhythms, influencing sleep patterns and overall health in response to light exposure.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge about optical filters and their properties with this quiz. Learn about how filters transmit, absorb, and reflect light of different wavelengths, and their various applications in optical systems.