1)state the laws of refraction. 2)what is lateral displacement? state the factor on which lateral displacement depends

ICSE Class 8 Answered

1)state the laws of refraction. 2)what is lateral displacement? state the factor on which lateral displacement depends

Asked by nathsantanukumar | 13 Apr, 2018, 07:26: PM

Expert Answer

Laws of refraction

(1) The incident ray, the refracted ray and the normal at the point of incidence, all lie in the same plane

(2) The ratio of the sine of the angle of incidence i to the sine of the angle of refraction r is constant for the pair of given media. This constant is called the refractive index of the second medium with respect to first medium.

hence sin i / sin r = ₁μ₂

where ₁μ₂ is the refrative index of medium where refracted ray travels and it is with respect to the first medium where light ray is incident.

Lateral displacement:

Due to refraction of light through two parallel sided glass block, the angle of incidence is equal to the angle of emergence, so the incident ray is parallel to the emergent ray ( i.e. they are in the same direction) but they are not along the same line. The emergent ray is laterally displaced from the path of incidence ray. The perpendicular distance between the emergent ray and incident ray is called the lateral displacement.

The lateral displacement depends on

(1) the thickness of glass block

(2) The angle of incidence

(3) The refractive index of the glass, and therfore also on the wavelength of light used.

Answered by Thiyagarajan K | 16 Apr, 2018, 11:16: AM