Question

1.write the laws of refraction
2.state ¹n² in terms of velocity ​

Answer 1

Answer:

Snell's law is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.

Formula

n_1 \sin \theta_1 = n_2 \sin \theta_2

n_1 = incident index

n_2 = refracted index

\theta_1 = incident angle

\theta_2 = refracted angle

Answer 2

1. Laws of Refraction

• The incident ray, the refracted ray and the normal to the point of interface of two transparent media at the point of incidence, all lie on the same plane
• The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given colour and for the given pair of media. This law is also known as Snell's law of refraction.

Sin i/Sinr = Constant

2. Refractive index of 1 with respect to 2 is the ratio of the velocity of light in medium 1 to that of the velocity of light in medium 2

From the given figure:

$\mathsf{_{1}n_{2} = \frac{Velocity \:of\: light\: in\: air\:(v1) }{Velocity\:of\:light\:in\:glass\:(v2)}}$