Questions and Answers
An image produced by a flat (plane) mirror is?
Virtual and upright
An incident light ray strikes a flat mirror at an angle of 30 degrees from the normal. The reflected light ray reflects off the mirror at what degrees from the normal?
30 degrees
As an object moves towards a flat mirror, its image does what?
Moves closer to the mirror
What is reflection?
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What is refraction?
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What is the angle of incidence?
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What is the angle of reflection?
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What is the name of the angle between the reflected ray and the normal?
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What is the reference line that is perpendicular to the interface called?
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What does the index of refraction indicate?
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What is Snell's Law?
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What is the law of reflection?
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How would a diamond refract light compared to glass?
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How do the original ray of light in the air and the final ray of light in air (after it went through the glass) compare?
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If a ray of light were incident upon your glass rectangle directly in line with the normal, how would it proceed into the glass?
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Which material has the highest index of refraction?
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An incident ray strikes a mirror at an angle of 15 degrees from the normal. The reflected light ray reflects off the mirror at what angle?
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Name a letter that would look identical in a flat mirror.
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What kind of mirror produces a virtual and upright image?
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What is the reflected ray?
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As a light ray enters a glass block at some angle other than 90 degrees, it will...
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If a light ray enters a glass block at some angle other than 90 degrees, how will it bend as it re-enters the air?
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Put the following materials in order from the LOWEST index of refraction to the GREATEST: Air, Water, Glass, Diamond.
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Put the following materials in order from the SLOWEST light speed to the GREATEST light speed: Diamond, Glass, Water, Air.
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How does the incident ray of light in air and the final light in air (after it leaves the glass) compare?
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What will happen if a ray of light enters into glass from air at 90 degrees?
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What is the critical angle?
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What is total internal reflection?
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If your total angle between the incident ray and reflected ray is 100 degrees, and your angle of incidence is 50 degrees, how many degrees is your angle of reflection?
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If your total angle between the incident ray and reflected ray is 20 degrees, and your angle of reflection is 10 degrees, how many degrees is your angle of incidence?
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What is it called when light bends as it passes from one medium to another?
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If your angle of incidence is 30 degrees, how many degrees is your angle of reflection?
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If my angle of incidence is 25 degrees, as my light ray enters a piece of glass, will my angle of refraction be greater than 25 degrees or less than 25 degrees?
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What is the name of the angle between the incident ray and the normal?
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An incident ray strikes a mirror at an angle of 55 degrees from the normal. The reflected light ray reflects off the mirror at what angle?
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When a light ray ENTERS DIAMOND from air, which way will the refracted ray bend?
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When a light ray ENTERS GLASS from air, which way will the refracted ray bend?
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When a light ray ENTERS WATER from air, which way will the refracted ray bend?
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When a light ray ENTERS AIR from glass, which way will the refracted ray bend?
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When a light ray ENTERS AIR from diamond, which way will the refracted ray bend?
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When a light ray ENTERS AIR from water, which way will the refracted ray bend?
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As an object moves closer to a flat mirror, its image does what?
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What is it called when there is a change in the direction of a light wave when it bounces off a surface?
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What is it called when the incident ray exceeds the critical angle?
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Study Notes
Reflection and Refraction Concepts
- An image from a flat mirror is virtual and upright.
- Incident and reflected rays maintain equal angles to the normal at interfaces.
- As objects approach a flat mirror, their images appear to move closer as well.
Reflection
- Reflection occurs when a light wave bounces off a surface, changing direction.
- The angle of incidence equals the angle of reflection, as defined by the Law of Reflection.
- The reflected ray is the light that bounces back from a surface.
Refraction
- Refraction is the bending of light as it transitions between different media.
- The index of refraction indicates the speed of light in a substance; diamond has the highest index.
- Snell's Law describes the ratio of the sine of the angles of incidence and refraction.
Angles and Measurements
- The normal line is a reference line perpendicular to the surface at the point of incidence.
- Angle of incidence: Angle between the incoming ray and the normal.
- Angle of reflection: Angle between the reflected ray and the normal.
- Critical angle: The incidence angle that results in light refracting at 90 degrees.
- Total internal reflection occurs when the incidence angle exceeds the critical angle.
Light Behavior in Different Media
- Light entering from air to glass, diamond, or water bends towards the normal.
- Light entering air from glass, diamond, or water bends away from the normal.
- Light maintains parallelism when comparing incident and final rays in air after traveling through instruments.
Practical Applications
- Identical letters in mirrors include O, A, T, M, W, Y, H, I, U, V, X.
- Light behavior through materials can be observed through experiments with angle measurements to understand reflection and refraction.
Material Properties and Light Speed
- Materials ordered by index of refraction: Air < Water < Glass < Diamond.
- Materials ordered by speed of light: Diamond < Glass < Water < Air.
- Entry angles impact refraction—angles of refraction are less than the incidence angle when entering denser media.
Quick Reference
- If a light ray strikes a mirror at 15 degrees, it reflects at the same angle.
- No bending occurs when light hits glass directly along the normal (90 degrees).
- In air, both incident and final light rays remain parallel after interaction with other media.
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Description
Explore the fundamental concepts of reflection and refraction in physics. Learn about how light behaves when encountering different surfaces, including the laws that govern these phenomena. This quiz tests your understanding of angles and measurements associated with both reflection and refraction.
