- Wavelength: Critical angle increases with increase in wavelength (least for violet).
- Temperature: Critical angle increases with increase in temperature.

Physics

- Wavelength: Critical angle increases with increase in wavelength (least for violet).
- Temperature: Critical angle increases with increase in temperature.

$n_{1}sinθ_{i}=n_{2}sinθ_{r}$

$n_{1}sinθ_{crit}=n_{2}sin90_{∘}$

$sinθ_{crit}=n_{1}n_{2} $

$sinθ_{crit}=n_{12}1 $

$n_{12}$ : Refractive index of denser medium 1 with respect to rarer medium 2.