Human Eye and the Colourful World

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

• To produce tears

• To protect the eye from dust

• To focus light on the retina

• To control the size of the pupil

What is the least distance of distinct vision for a young adult with normal vision?

• 50 cm

• 10 cm

• 100 cm

• 25 cm

What type of lens is used to correct myopia?

• Convex lens

• Concave lens

• Cylindrical lens

• Bifocal lens

What is hypermetropia also known as?

• Astigmatism

• Near-sightedness

• Presbyopia

• Far-sightedness

What is the far point of a normal eye?

• 5 m

• 1 m

• 25 cm

• Infinity

What happens to the eye lens when looking at distant objects?

• It changes color

• It becomes thicker

• It becomes thinner

• It remains the same

What is the power of accommodation in the eye?

• The ability to focus on objects at different distances

• The ability to perceive depth

• The ability to detect light

• The ability to see colors

What causes the twinkling of stars?

• Brightness of the stars

• Color of the stars

• Distance from Earth

• Atmospheric refraction

What is the condition called when the crystalline lens becomes cloudy?

• Cataract

• Glaucoma

• Myopia

• Astigmatism

What is the main reason for the blue color of the sky?

• Reflection of the ocean

• Absorption of light

• Scattering of light

• Refraction of light