Confused About Critical Angle and Echoes?

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SUMMARY

The discussion centers on the confusion surrounding the calculation of the critical angle in optics and its relation to echoes. A participant calculated the first critical angle and concluded that no echoes occur because the incident angle exceeds the critical angle, preventing refraction. Another participant requested detailed calculations and a diagram to clarify the setup, indicating that visual aids are essential for understanding the problem.

PREREQUISITES
  • Understanding of Snell's Law in optics
  • Knowledge of critical angle and total internal reflection
  • Familiarity with basic trigonometry
  • Ability to interpret and create diagrams for optical setups
NEXT STEPS
  • Study Snell's Law and its applications in optics
  • Learn about total internal reflection and its implications in various mediums
  • Practice calculating critical angles for different materials
  • Explore the use of diagrams in solving optics problems
USEFUL FOR

Students studying physics, particularly those focusing on optics, educators teaching related concepts, and anyone interested in understanding the principles of refraction and critical angles.

Nubira20
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Homework Statement
One longitudinal US pulse was emitted inside a steel sheet that is 1cm wide at an angle of 15 o . Lubrication oil covers the backside of the steel sheet. You know that US velocity in steel is 6.2km/s and 4.1km/s for longitudinal and sheer waves, and 1.3km/s in oil. what is the (lateral) distance (on the sheet surface) between the source pulse and the longitudinal echo?
Relevant Equations
Snell's law
I calculated the first critical angle and found the incident angle here to be greater than it thus there no echoes because the beam didn't refract , but i asked a friend and he told me no and that he calculated a number .. any help ?
 
Physics news on Phys.org
Welcome to the PF. :smile:

Can you show your detailed calculations please? That will make it easier for us to help you. Thanks.
 
Not sure I understand the set-up. Please post a diagram.
 

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