In bright light, the iris_______and the pupil________to control the amount of light entering the eye.

Related Mcqs:

1. The amount of light entering the eye is regulated by the _______________?

   A. lens
   B. iris
   C. retina
   D. Coptic nerve

2. The muscle fibers of the iris can increase or decrease the amount of light entering the eye by expanding or contracting the ______________?

   A. lens
   B. cornea
   C. pupil
   D. fovea

3. When light changes from bright to dim the iris of the eye ________________?

   A. dilates
   B. constricts
   C. thickens
   D. remains the same

4. Kim is trying to thread a needle, but the light is fairly dim. Due to the lack of light, the part of her eye that will help most in threading the needle is ________________?

   A. cones
   B. rods
   C. lens
   D. cornea

5. Waqas looked directly into a very bright light and damaged his retina. The ophthalmologist has told him that he has sustained massive damage to his rods but for the most part his cones have not been affected. One change that you could predict for Waqas’ vision is that he will now have:

   A. more accurate depth perception
   B. poor vision in bright illumination
   C. poor vision in low illumination
   D. poor peripheral vision

6. Petra locked directly into a very bright light and damaged her retina. The ophthalmologist has told her that she has sustained massive damage to her cones, but for the most part her rods have not been affected. One change that you could predict for Petra’s vision is that she will now have:

   A. Poor vision in bright light
   B. No color vision
   C. Poor vision in low illumination
   D. More accurate depth perception

7. The process in which your eyes adjust from darkness to bright light is called _______________?

   A. dark adaptation
   B. light adaptation
   C. coding of contrast
   D. coding of light intensity patterns

8. Which of the following explains why a rose appears equally red in bright and dim light?

   A. the Young-Helmholtz theory
   B. the opponent-process theory
   C. feature detection
   D. color constancy

9. A psychologist watches the rapid eye movements of sleeping subjects and wakes them to find they report that they were dreaming. She concludes that dreams are linked to rapid eye movement. this conclusion is based on:

   A. pure speculation
   B. direct observation
   C. deduction from direct observation
   D. prior prediction

10. If the human eye was not responsive to differences in the wavelength of light, we would not be able to perceive differences in:

    A. Intensity
    B. Color
    C. Purity
    D. Brightness