Human Eye and C...

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

The change in focal length of an eye lens is caused by the action of

A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?

The persistence of vision for human eye is

Which phenomenon is responsible for the twinkling of stars?

Twinkling of stars is due to atmospheric

Colored portion of eye that controls amount of light reaching retina is known as

Human eye acts like a

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

Red colour of the sun at the time of sunrise and sunset is because­