Respuesta :

skyluke89

The image is real when A) [tex]+d_i[/tex]

Explanation:

The terms listed are the terms used in the lens equation. The lens equation is an equation that allows to determine the distance of the image produced by a lens when an object is placed in front of the lens. The same equation can also be used for mirrors. The equation is the following:

[tex]\frac{1}{f}=\frac{1}{d_o}+\frac{1}{d_i}[/tex]

where

f is the focal length of the lens

[tex]d_o[/tex] is the distance of the real object from the lens

[tex]d_i[/tex] is the distance of the image from the lens

According to the signs of f and [tex]d_i[/tex], we have different situations (the sign of [tex]d_o[/tex] is always taken positive):

  • For a converging lens, the focal length f is positive
  • For a diverging lens, the focal length f is negative
  • If the image is produced behind the lens, the image is said to be real, and the sign of [tex]d_i[/tex] is positive
  • If the image is produced in front of the lens (on the same size of the object), the image is said to be virtual, and the sign of [tex]d_i[/tex] is negative

Therefore, the choice that indicates a real image is

A) [tex]+d_i[/tex]

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