The Human Eye and Colourful World
The human eye forms the image of an object at its:
The least distance of distinct vision for a young adult with normal vision is about:
The change in focal length of an eye lens is caused by the action of the:
A person needs a lens of power -5.5 D for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 D. What is the focal length of the lens required for correcting distant vision?
The dark muscular diaphragm that controls the size of the pupil is:
The defect of vision in which a person can see distant objects distinctly but cannot see nearby objects clearly is:
Myopia is corrected by using a:
The splitting of white light into its component colors is called:
Which of the following colors bends the least when white light passes through a prism?
The blue color of the clear sky is due to:
At sunrise or sunset, the sun appears reddish because:
The phenomenon of twinkling of stars is primarily due to:
Danger signal lights are red in color because the red light is:
The ability of the eye lens to adjust its focal length is called:
In old age, people often lose the ability to accommodate, and their near point shifts away. This defect is called:
A bifocal lens consisting of both concave and convex lenses is used to correct:
When the crystalline lens of people at old age becomes milky and cloudy, the condition is called:
Which part of the human eye is sensitive to light and generates electrical signals?
The Tyndall effect is observed when light passes through:
Advance sunrise and delayed sunset are phenomena caused by:
The defect of vision in which a person cannot see distant objects distinctly is called:
The human eye forms the image of an object at which of its following parts?
The refractive index of glass is maximum for which color of light?
The split of white light into its constituent colours when passing through a glass prism is known as:
Which phenomenon of light is responsible for the twinkling of stars?