A 14 year old student is not able to see clearly the questions written of the black board placed at a distance of 5 m from him.
Draw the diagram to show how this defect can be corrected.

A 14 year old student is not able to see clearly the questions written of the black board placed at a distance of 5 m from him. Draw the diagram to show this defect?

A 14 year old student is not able to see clearly the questions written of the black board placed at a distance of 5 m from him. Name two possible cause of this defect.

A 14 year old student is not able to see clearly the questions written of the black board placed at a distance of 5 m from him. Name the type of lens used to correct this defect?

(a) A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.

Eye is a natural optical device by which human could see objects around him. It forms an inverted, real image on a light sensitive surface called retina. It works on the phenomenon of refraction of light through a natural convex lens. However, Sanjana was unable to see clearly the words written on the black board placed at a distance of approximately 3.5m from her. Her mother discussed the same with the doctor. Doctor explained her about this defect of vision and its correction. What kind of defect Sanjana is suffering from?

Eye is a natural optical device by which human could see objects around him. It forms an inverted, real image on a light sensitive surface called retina. It works on the phenomenon of refraction of light through a natural convex lens. However, Sanjana was unable to see clearly the words written on the black board placed at a distance of approximately 3.5m from her. Her mother discussed the same with the doctor. Doctor explained her about this defect of vision and its correction. Identify the possible cause of the defect from the following:

Eye is a natural optical device by which human could see objects around him. It forms an inverted, real image on a light sensitive surface called retina. It works on the phenomenon of refraction of light through a natural convex lens. However, Sanjana was unable to see clearly the words written on the black board placed at a distance of approximately 3.5m from her. Her mother discussed the same with the doctor. Doctor explained her about this defect of vision and its correction. ______ power of lens shows that it is concave lens.