Question

What are the rules of sign convention

Answer 1

Rules for sign convention :

All distances should be measured from the pole.

The distances measured in the direction of incident light, to be taken positive and measured in the opposite direction of incident light to be taken negative.

Height of object and height of image are positive if measured upward from the axis and negative if measured downward.

For a concave mirror 'f and ‘R’ are negative and for a convex mirror these are positive.

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Answer 2

$\Large\underline\mathfrak{Question}$

What are the rules of sign convention.?


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$\Large\bold\star\underline{\underline\textbf{Sign Conventions's Rules\:}}$


→ All the distances are measured from the pole of the surface.

→ The distances measured in the direction of incident light are taken as positive.

→ The distances measured in the direction opposite to the direction of incident light are taken as negative.

→ The perpendicular distances upwards to the principal axis are taken as positive and that in down ward direction are taken as negative.


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$\Large\bold\star\underline{\underline\textbf{Assumption\:}}$

→ Object is taken as point object lying on the principal axis.

→ The aperture of refracting surface is small.

→ The incident ray strikes the surface at a point very close to point, so the angle of incidence and refraction is very small.





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