A child while playing with his father's spectacles, burnt a hole in a piece of tissue paper by focussing the image of the sun on the paper.
(a) Name the defect of vision his father is suffering from.
(b) List two causes of the defect.
( c) Draw a ray diagram to show this defect may be corrected using a suiable lens.

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

A person cannot see distinctly the book placed nearer than 60 cm from his eyes. (i) Name the defect of vision the person is suffering from. (ii) List two possible causes of this defect. (iii) Draw a ray diagram to show this vision defect. (iv) How can this defect be corrected ? (v) Draw a ray diagram to show the correction of this defect.

(a) A student cannot see clearly a chart hanging on a wall placed at a distance of 3m from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. (b) Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length. (c) What do you mean by the 'Power of Accommodation' of human eye?

Aniket from Std. X uses spectacles. The power of the lenses in his spectacles is -0.5 D. name the defect of vision Aniket is suffering from.

Study the diagram and answer the questions the follow it : (i) Which defect of vision is represented in the case ? Give reason for your answer. (ii) What could be two causes of this defect ? (iii) With the help of a diagram show how this defect can be corrected by the use of a suitable lens.