Understanding Human Vision and Optical Illusions

What is the primary purpose of optical illusions?

• To entertain viewers

• To confuse the brain

• To explore the disconnect between sensation and perception

• To improve vision

What percentage of sensory receptors are located in the human eyes?

• 70%

• 30%

• 50%

• 90%

What does the frequency of a light wave determine?

• Its amplitude

• Its hue

• Its speed

• Its intensity

What is the function of the cornea in the human eye?

• To protect the eye from dust

• To focus light onto the retina

• To let light into the eye

• To control the amount of light entering the eye

What role does the iris play in the human eye?

• It protects the cornea

• It detects color

• It controls the size of the pupil

• It focuses light onto the retina

What is the primary function of the lens in the human eye?

• To protect the inner eye

• To focus light onto the retina

• To detect light intensity

• To provide structural support to the eye

What are the two types of photoreceptors in the human eye?

• Rods and discs

• Cones and cylinders

• Rods and cones

• Pixels and bits

How do rods differ from cones in their function?

• Cones are less light-sensitive than rods

• Rods detect color, cones do not

• Cones detect fine detail, rods do not

• Rods detect brightness, cones detect darkness

What causes the afterimage effect in the flag illusion?

• Change in pupil size

• Tiredness of cones

• Persistence of vision

• Reflection of light

Why do cones get tired when viewing bright colors for an extended period?

• Because of the reduction in blood supply

• Due to a shift in light wavelength

• Due to a decrease in light intensity

• Because they receive the same stimulus for too long