7.05: Light: Refraction: Critical Angle Calculations

The critical angle for a certain medium is 40^o. What is its refractive index?

• 1.56

• 1.7

• 1.3

• 1

The critical angle for diamond is 24.6^o. What is its refractive index?

• 1.6

• 3.5

• 2.4

• 0

The refractive index of a certain type of glass is 1.2. What is the critical angle between the glass and air?

• 55.7^o

• 56.4^o

• 48.75^o

• 40^o

Find the critical angle of a medium whose refractive index is 1.66.

• 32.6^o

• 30.7^o

• 37.04^o

• 40^o

What is the apparent depth of an object in a block of material whose critical angle is 40^o ? The object is viewed perpendicularly from air and its real depth is 12 cm.

• 8.91 cm

• 6.56 cm

• 13.4 cm

• 7.7 cm