The critical angle is the angle of refraction in denser medium in which the angle of incidence in less dense medium is 90º.

• True

• False

If the angle of incidence is larger than the critical angle of a medium, total internal reflection occurs.

• True

• False

Which diagram correctly describes the critical angle c for air-water surface?

• A

• B

• C

• D

Light travels through a glass block as shown. Which angle is the critical angle for light in the glass?

• A

• B

• C

• D

In which diagram is the path of the light ray NOT correct?

(Determine if the light ray is correctly bending towards or away from normal at each boundary)

P/S: Perspex is acrylic plastic.

• A

• B

• C

• D

Tags

NGSS.HS-PS4-1

The refractive index of a glass prism is 1.9. Determine its critical angle.

• 23^o

• 30^o

• 32º

• 35^o

What happens to light during total internal reflection?

• The angle of incidence is greater than the critical angle.

• The angle of reflection is the same as the critical angle.

• The angle of refraction is less than the critical angle.

• The angle of incidence is zero.

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-5

Fiber optic cables work because of the principle of _____.

• total internal refraction

• incomplete internal refraction

• total internal reflection

• partial internal reflection

When angle of incident (i) equals to critical angle (c) if light is traveled from a denser medium to a less dense medium,

• total internal reflection occurs.

• angle of refraction is equal to 90 degree.

• light is refracted out

• light travel in straight line

What is total internal reflection

• Where a wave is refracted at the boundary between a dense medium and a less dense medium when the angle of incidence is greater than the critical angle.

• Where a wave is refracted at the boundary between a dense medium and a less dense medium when the angle of incidence is smaller than the critical angle.

• Where a wave is reflected at the boundary between a dense medium and a less dense medium when the angle of incidence is greater than the critical angle.

• Where a wave is reflected at the boundary between a dense medium and a less dense medium when the angle of incidence is smaller than the critical angle.

Tags

NGSS.HS-PS4-5