Respuesta :
D.-di represents an image that is located in front of a lens
What is a lens?
Lenses are basically magnifying glasses with curved sides. A lens is a piece of transparent glass which concentrates or disperses light rays when passes through them by refraction. Due to the magnifying property, lenses are used in telescopes and other magnifying devices. They are employed in cameras for gathering the light rays.
According the sign convention , if anything (object/image ) is present in front of the mirror / lens , then its sign convention will be negative according to the coordinate system as it is on the negative x axis.
From question it is been observed that it is an image hence , taking di .
Also it is placed in front of the lens hence , its sign convention will be negative.
correct option is D) -di
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