Which of the following colors is least scattered by fog, dust of smoke?
The light sensitive cell present on retina and is sensitive to the intensity of light is:
The part of the eyes refracts light entering the eye from external objects?
Condition in which image is formed behind retina is called
Greatest refraction of light is caused through
Which of the following phenomena of light are involved in the formation of a rainbow?
Answer: Refraction, dispersion and internal reflection
The bluish colour of water in deep sea is due to
Answer: scattering of light
Function of eyelids includes
Twinkling of stars is due to atmospheric
Answer: refraction of light by different layers of varying refractive indices
Internal reflection of light is prevented through the
Condition in which image is formed in front of retina is called
Runny nose and crying may be outcomes of
The persistence of vision for human eye is
Answer: 1/16th of a second
Light enters eye through a transparent membrane known as
Variation of focal length to form a sharp image on retina is called
Inability of eye to see objects clearly is called
In human eye, image is formed