What are main defects of vision? Describe clearly with diagrams how are they corrected?

A person wear spectacles of power-2.3 D Name the defect of vision he is suffering from.Draw the ray diagram for: Its correction after using a suitable lens.

What is Myopia (nearsightedness) ? What are its causes ? Explain with the help of diagram how it can be corrected ?

What is meant by 20//20 vision?

What are the two main events of protein synthesis? Describe transcription.

Describe excretory organs in man with diagram.

A person wear spectacles of power-2.3 D Name the defect of vision he is suffering from.Draw the ray diagram for: The defective eye