Test 2: Total Internal Reflection, Optical Fibres, Lenses, Eye and Dispersion

Question 1

The angle of incidence for which the angle of refraction is 90° is called the:

• Aangle of deviation
• Bcritical angle
• Cangle of reflection
• Dangle of prism

Question 2

Total internal reflection occurs when light passes from a denser to a rarer medium and the angle of incidence is:

• Aless than the critical angle
• Bequal to zero
• Cgreater than the critical angle
• Dless than the angle of refraction

Question 3

Which statement best describes the phenomenon of total internal reflection?

• ALight bends when it enters a new medium
• BLight is completely reflected at the boundary of two media
• CLight slows down as it enters a denser medium
• DLight passes through a medium without changing direction

Question 4

The critical angle for water (n = 1.33) is:

• A48.8°
• B41.2°
• C42.0°
• D24.4°

Question 5

According to Table 14.1, which medium has the smallest critical angle?

• AWater
• BIce
• CDiamond
• DPerspex