Total internal reflection

What is the angle of refraction if i=C?

• 60°

• 40°

• 90°

• 80°

What is the correct definition of critical angle?

• The angle at which angle of refraction=90°

• The angle at which angle of reflection =90°

• The angle at which partial reflection and refraction = 90°

• The angle at which no refraction takes place

Which of these is the correct equation for refractive index?

Which of these are the correct factors necessary for total internal reflection to take place? Choose all that apply.

• i > C

• i < C

• light has to travel from denser to rarer medium

• light has to travel from rarer to denser medium

This image shows deviation through:

• 180°

• 90°

• 45°

• 60°

This image shows deviation through:

• 90°

• 270°

• 180°

• 60°

Where is deviation through 90° used?

• stethoscope

• periscope

• camera

• binoculars

Where is deviation through 180° used? Choose all that apply.

• stethoscope

• binoculars

• camera

• periscope

What is the angle of incidence at surface KM?

• 30°

• 90°

• 60°

• 42°

What is the angle of incidence at surface XZ? Where will the ray emerge from?

• 30°, XZ

• 30°, XY

• 60°, XZ

• 60°, XY