Question

Account for the following a) The condition due to which eye lens becomes cloudy. b) The range of vision of a normal eye. c) the factors on which colour of the scattered white light depends. d) The sky appears dark to the astronauts in the space. e) Part of the human eye which help in changing the focal length of the eye lens. Please tell me

Answer 1

b)25cm to infinity
a)cataract
c)Distance from sun
d)There is no scattering of light due to absence of an atmosphere
e)Crystalline lens

Answer 2

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a) Cataract is the condition that result dueto the eye lens becoming cloudy.

b) near by range - 25 cm
and far by range-away 25cm and infinity...

c) Scattering of the light depends on the wavelength of the light. The light with a higher wavelength scatters less when compared to the light with a lower wavelength.The wavelength of VIBGYOR is in the increasing order of the wavelength and that is the reason why red colour light scatters minimum amongst all the seven colours.

d) The sky appears dark instead of blue toan astronaut because there is no atmosphere in the outer space that can scatter the sunlight. As the sunlight isnot scattered, no scattered light reach the eyes of the astronauts and the sky appears black to them

e) The eye focus length is changed by the action of ciliary muscles.

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