The line BL in the given figure is called [[1]].

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Detailed Solution

The line BL represents the lateral shift of light.
The perpendicular distance between the ray extended and the emergent ray is called the lateral shift of light. The general formula for a lateral shift is

Δ = \frac{t sin (i - r)}{cos r}

Where

Δ

is the lateral shift

t

is the thickness of the medium

i

is the angle of incidence

r

is the angle of refraction
This shift depends upon the angle of incidence, the angle of refraction, and the thickness of the medium.

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