3.2 – Measuring the Critical Angle and Refractive Index (Leaving Cert Physics): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What defines the critical angle in this experiment?
What defines the critical angle in this experiment?
Angle where refracted ray is at 90° to normal
What formula relates refractive index to critical angle ?
What formula relates refractive index to critical angle ?
How does critical angle relate to refractive index?
How does critical angle relate to refractive index?
Higher refractive index = smaller angle
Which piece of equipment provides the transparent material being tested?
Which piece of equipment provides the transparent material being tested?
Semicircular glass block
What indicates you have reached the critical angle?
What indicates you have reached the critical angle?
Refracted ray emerges parallel to surface
What happens to light going from denser to less dense medium?
What happens to light going from denser to less dense medium?
Bends away from the normal
How should the semicircular glass block be positioned initially?
How should the semicircular glass block be positioned initially?
Flat-side down on paper
If critical angle , what is the refractive index? (given )
If critical angle , what is the refractive index? (given )
1.49
Why should the experiment be repeated 3-4 times?
Why should the experiment be repeated 3-4 times?
To improve reliability of results
How should you read the protractor to avoid parallax error?
How should you read the protractor to avoid parallax error?
From directly above
Why must you use a finely sharpened pencil?
Why must you use a finely sharpened pencil?
For precise marking and accuracy
When does total internal reflection occur?
When does total internal reflection occur?
When angle of incidence exceeds critical