Question Detail
Question
For the hyperopic eye described in Example 1, which has a near point of 100 cm, a corrective lens is needed to allow clear vision of an object placed at 25 cm. What is the required virtual image distance (v) that the corrective lens should form for this object?
Correct Answer
Option D is the correct answer.
Detailed Explanation
The document explains that the eye can focus an image when an object (or the near point) is 100 cm from it. For the corrective lens, the image it forms must appear at this uncorrected near point (100 cm) and be virtual (on the same side as the object, hence negative). The text explicitly shows '1/v = -1/100' for this purpose.
Hint
The corrective lens must create a virtual image at the eye's existing near point for the eye to be able to focus it. Virtual images are denoted with a negative sign.