Human Eye and Colourful World

What is the least distance of distinct vision for a healthy person?

• 7-8 cm

• 15 cm

• 25 cm

• 50 cm

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

• Refraction

• Dispersion

• Accommodation

• Reflection

The defect of vision where a person cannot see distant objects clearly is called:

• Hypermetropia

• Myopia

• Presbyopia

• Astigmatism

To correct myopia, we use:

• Convex lens

• Concave lens

• Cylindrical lens

• Bifocal lens

The defect of vision where a person cannot see nearby objects clearly is called:

• Myopia

• Hypermetropia

• Color blindness

• Night blindness

Presbyopia is a vision defect associated with:

• Childhood

• Teenage years

• Middle age

• Ageing

The reciprocal of focal length is called:

• Power of lens

• Magnification

• Refraction

• Dispersion

The unit of power of a lens is:

• Meter

• Centimeter

• Dioptre

• Hertz

The splitting of white light into different colors is called:

• Reflection

• Refraction

• Dispersion

• Scattering

In a prism, which color deviates the least?

• Violet

• Green

• Yellow

• Red