1.

What will be the sign if image distance of concave or convex lens or mirror is given?

Answer» It depens whether the image formed is real or virtual.If it is virtual, then:In mirrors-v= positive In lenses-v= negativeIf it is real, then:In mirrors-v= negativeIn lenses-v= positive
It depends on the object position and nature of the image..both the signs can possible..
Concave (-)convex +
Concave mirror(-) and convex mirror (+)
Concave mirror ( + ) and convex mirror( -)


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