question_answer 30)

  The focal length of the eye lens increases when eye muscles                 (a) are relaxed and lens becomes thinner             (b) contract and lens becomes thicker                 (c) are relaxed and lens becomes thicker              (d) contract and lens becomes thinner

Answer:

                  (A) The focal length of the eye lens increases when eye muscles relaxed and becomes thinner. The sharp image of the distant object is formed at the retina. This enables us to focus accurately on distant objects.