What power of spectacle lens is needed to correct the vision of a nearsighted person whose far point is 30.0 cm? Assume the spectacle (corrective) lens is held 1.50 cm away from the eye by eyeglass frames.

Strategy

You want this nearsighted person to be able to see very distant objects clearly. That means the spectacle lens must produce an image 30.0 cm from the eye for an object very far away. An image 30.0 cm from the eye will be 28.5 cm to the left of the spectacle lens (see Figure 26.6). Therefore, we must get d_i = -28.5 cm when d_o ≈ ∞. The image distance is negative, because it is on the same side of the spectacle as the object.

Data from Figure 26.6

Transcribed Image Text:

Distant object Distant object Image