The critical angle for glass-air is 45° for the light of yellow colour. State whether it will be less than, equal to, or more than 45° for (i) red light, (ii) blue light?

Home » The critical angle for glass-air is 45° for the light of yellow colour. State whether it will be less than, equal to, or more than 45° for (i) red light, (ii) blue light?

The critical angle for glass-air is 45° for the light of yellow colour. State whether it will be less than, equal to, or more than 45° for (i) red light, (ii) blue light?

Class 10 | ICSE | Physics | Refraction of Light at Plane Surfaces | Selina

The critical angle for glass-air is 45° for the light of yellow colour. State whether it will be less than, equal to, or more than 45° for (i) red light, (ii) blue light?

Solution:

The refractive index increases (or drops) when the wavelength of light decreases (or increases), and the critical angle decreases (or more)

(i) The crucial angle for red light will be more than 45 degrees.

(ii) The crucial angle for blue light will be less than 45 degrees.

i

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