11. The ability of the eye to see objects at different distances by adjusting the shape of the lens is called:
a) Accommodation
b) Refraction
c) Reflection
d) Dispersion
12. The part of the eye that contains photoreceptor cells responsible for color vision is the:
a) Retina
b) Optic nerve
c) Sclera
d) Choroid
13. The area on the retina that contains only cone cells and provides the sharpest vision is called the:
a) Fovea
b) Optic disc
c) Blind spot
d) Pupil
14. The blind spot in the human eye is caused by:
a) Absence of rod cells
b) Absence of cone cells
c) Absence of photoreceptor cells
d) Absence of blood vessels
15. The color of an object depends on the:
a) Intensity of light falling on it
b) Wavelength of light reflected from it
c) Speed of light incident on it
d) Refractive index of the surrounding medium
