Reflection and Light Properties

This video tutorial covers the basic principles of light reflection and absorption. It begins with an explanation of reflection, detailing how the type of surface, angle of incidence, and spectral composition affect the amount of light reflected. The tutorial distinguishes between specular, diffuse, and mixed reflection, and explains total internal reflection, including its conditions and applications in optical fibers. Finally, it discusses light absorption, how non-reflected light is absorbed or transmitted, and its conversion into heat energy.

What factors influence the amount of light reflected from a surface?

• Angle of reflection, surface area, and light speed

• Surface texture, light intensity, and air pressure

• Temperature, humidity, and surface color

• Type of surface, angle of incidence, and spectral composition

Which type of reflection occurs on a smooth surface like polished glass?

• Mixed reflection

• Total internal reflection

• Specular reflection

• Diffuse reflection

What is another name for specular reflection?

• Diffuse reflection

• Mixed reflection

• Mirror reflection

• Total internal reflection

What type of reflection occurs when light is reflected in all directions due to surface irregularities?

• Total internal reflection

• Specular reflection

• Diffuse reflection

• Mixed reflection

Which type of mixed reflection is produced by a corrugated or tarnished surface?

• Diffuse reflection

• Specular reflection

• Total internal reflection

• Spread reflection

What is the phenomenon called when light is completely reflected within a medium?

• Specular reflection

• Diffuse reflection

• Total internal reflection

• Mixed reflection

For total internal reflection to occur, light must travel from a denser medium to a rarer medium and the angle of incidence must be greater than what?

• Refractive index

• Absorption coefficient

• Reflection angle

• Critical angle

What is the critical angle for glass and air?

• 42 degrees

• 30 degrees

• 90 degrees

• 60 degrees

What happens to light that is not reflected by a non-transparent surface?

• It gets absorbed and converted into heat

• It gets transmitted

• It gets scattered

• It gets refracted

What is the relationship between energy and wavelength in light absorption?

• As energy increases, wavelength decreases

• Energy and wavelength are unrelated

• As energy decreases, wavelength increases

• As energy increases, wavelength increases