Human eye and the colourful world

What is/are the defect(s) of eye?

• Myopia

• Hypermetropia

• Presbyopia

• All of the above

A concave lens of suitable focal length is used for correcting a-

• Myopic eye

• Hypermetropic eye

• Both a and b

• None of the above

Splitting of white light into seven colours on passing through the glass prism is called-

• Reflection

• Refraction

• Dispersion

• Scattering

Two lenses of power -1.75D and +2.75D are placed in contact. What is the focal length of the combination?

• 50cm

• 100cm

• 75cm

• 125cm

The change of focal length of an eye lens to focus the image of the objects at varying distance is done by the action of -

• Pupil

• Retina

• Ciliary Muscles

• Blind Spot

Where does the image form in a human eye?

• Cornea

• Retina

• Pupil

• Iris

Which colour deviates the least when it passes through a prism?

• Violet

• Blue

• Red

• Green

Why does sky appear to be blue?

• Due to dispersion of light

• Due to scattering of light

• Due to refraction of light

• Due to diffraction of light

Variable focal length of eye is responsible for -

• Accomadation of eye

• Persistence of vision

• Colour blindness

• Least distance of distinct vision

The property of persistence of vision is used in -

• Colour Vision

• Myopia

• Presbyopia

• Cinematography