A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.

Answer:

If a student cannot see the blackboard distance to her she is suffering from Myopia. Hence doctor advises a concave lens of suitable focal length.

Myopia

Myopia is the inability of an eye in viewing long distant objects. The image in this case is formed before the retina. For every myopic eye, there exists a far point beyond which a clear image cannot be seen. The short-sightedness is corrected by using a concave lens which diverges and shifts the image to the retina.

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