Question

The image of an object formed on the retina of human eye is:

• A. Virtual and inverted
• B. Virtual and erect
• C. Real and inverted
• D. Real and erect

Answer 1

Answer:

C. Real and inverted

• At rest, the lens in the normal eye focuses images of distant objects on the retina.
• It acts in much the same way as a biconvex optical glass lens, however, it cannot be moved forward.
• Thus, the refractive power of the lens is a function of the curvature of the lens surfaces, as well as the refractive index of the cell mass.
• The closely packed, highly ordered array of lens cells is essential for optical quality, and even small defects in lens fiber cell anatomy can cause detectable spherical aberration.