Question

write the sign convection rule​

Answer 1

Answer:

f = focal length

u = object distance

u = image distance

1/f = 1/v + 1/u

f positive for converging lens(eg convex lens) or mirror(concave), negative for diverging lens(concave lens) or convex mirror.

image distance v is positive for real image, negative for virtual image.

object distance u positive for real object, negative for virtual object.

One might wonder how the hell a virtual object is even possible. Well it could be a virtual image(behind the mirror) of a real object in a system of mirrors for example:).

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Explanation:

Rules for sign convention :

1.All distances should be measured from the pole.

2.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.

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Answer 2

Answer:

1. all distances should be measured from the pole
2. the distances measured in the direction of incident light,to be taken positive and measured in the opposite direction of the incident light to be taken as negative