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A boy uses concave spectacles. What defe...

A boy uses concave spectacles. What defect does the have ? Draw a diagram

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A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens ? Draw the ray diagram.

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.