The Human Eye and the Colourful World

The coloured part of the eye that surrounds the pupil is:

1. Retina
2. Iris
3. Cornea
4. Lens

A person with cataract suffers from:

1. Clouding of the eye lens
2. Damage to optic nerve
3. Loss of colour vision
4. Increased pupil size

The phenomenon responsible for the twinkling of stars is:

1. Dispersion
2. Atmospheric refraction
3. Reflection
4. Total internal reflection

Which colour of visible light has the maximum wavelength?

1. Violet
2. Blue
3. Green
4. Red

What is the cause of presbyopia?

1. Damage to the retina
2. Ageing of the eye
3. Excessive light exposure
4. Colour blindness

Which cells of the retina are responsible for colour vision?

1. Rod cells
2. Cone cells
3. Nerve cells
4. Muscle cells

The minimum distance at which a person can see an object clearly is called:

1. Far point
2. Near point
3. Focal point
4. Optical centre

Which phenomenon causes the formation of a rainbow?

1. Reflection only
2. Refraction, dispersion, and internal reflection
3. Scattering only
4. Absorption only

The blue colour of the sky is due to:

1. Reflection of sunlight
2. Dispersion of sunlight
3. Scattering of light
4. Absorption of light

The splitting of white light into its constituent colours is called:

1. Reflection
2. Dispersion
3. Scattering
4. Refraction

Which lens is used to correct hypermetropia?

1. Concave lens
2. Convex lens
3. Cylindrical lens
4. Plane glass

A person suffering from myopia can see:

1. Nearby objects clearly but distant objects poorly
2. Distant objects clearly but nearby objects poorly
3. Both near and distant objects clearly
4. Neither near nor distant objects clearly

The ability of the eye lens to adjust its focal length is called:

1. Refraction
2. Accommodation
3. Dispersion
4. Reflection

The image formed on the retina of the human eye is:

1. Virtual and erect
2. Real and inverted
3. Virtual and inverted
4. Real and erect

The power (P) of a lens is related to its focal length (f) by which formula?

1. P = f
2. P = 1/f²
3. P = 1/f
4. P = f/2

Why does the Sun appear reddish during sunrise and sunset?

1. Reflection from clouds
2. Scattering of shorter wavelengths, leaving longer wavelengths to reach the observer
3. Refraction by the Earth's surface
4. Absorption of red light

Which defect of vision is commonly associated with old age?

1. Myopia
2. Hypermetropia
3. Presbyopia
4. Astigmatism

What is the near point of a normal human eye?

1. 25 cm
2. 2.5 cm
3. 2.5 m
4. 250 cm

Which phenomenon causes stars to twinkle?

1. Reflection
2. Refraction of starlight through the atmosphere
3. Dispersion
4. Diffraction

Why does the sky appear blue during the daytime?

1. Reflection of oceans
2. Refraction by clouds
3. Scattering of sunlight by atmospheric particles
4. Absorption of blue light

Which defect of vision can be corrected using a concave lens?

1. Hypermetropia
2. Presbyopia
3. Myopia
4. Cataract

What is the function of the eye lens?

1. To produce tears
2. To focus light on the retina
3. To protect the eye from dust
4. To detect colors

Which part of the eye acts like a screen where images are formed?

1. Cornea
2. Iris
3. Retina
4. Pupil

Which part of the human eye controls the amount of light entering the eye?

1. Retina
2. Iris
3. Cornea
4. Optic nerve