Which of the following will show Tyndall effect?

The correct answer is Option 2.
Key Points

• The Tyndall effect is the scattering of light as a light beam passes through a colloid.
• The individual suspension particles scatter and reflect light, making the beam visible.
• The Tyndall effect was first described by 19th-century physicist John Tyndall.
• In associated colloids, the formation of micelles takes place only above a particular temperature called Kraft temperature ​and above a particular concentration called critical micelle concentration (CMC).
• Below CMC, soap doesn't act as a colloid.