Lakhmir Singh and Manjit Kaur Solutions for Chapter: The Human Eye and The Colourful World, Exercise 6: Very Short Answer Type Questions

Name one defect of vision (or eye) which cannot be corrected by any type of spectacle lenses.
(Presbyopia/Cataract/ Myopia)

Name the body part with which the terms myopia and hypermetropia are connected.

Your friend can read a book perfectly well but cannot read the writing on blackboard unless she sits on the front row in class. Is she short-sighted or long-sighted?

Your friend can read a book perfectly well but cannot read the writing on blackboard unless she sits on the front row in class. What type of lenses-converging or diverging-would an optician prescribes for her?

A man can read the number of a distant bus clearly, but he finds difficulty in reading a book. From which defect of the eye is he suffering?

(Hypermetropia/Myopia)

A man can read the number of a distant bus clearly, but he finds difficulty in reading a book. What type of spectacle lens should he use to correct the defect?

A student sitting in the last row of the classroom is not able to read clearly the writing on the blackboard. Name the type of defect he is suffering from.

(Hypermetropia/Myopia)

A student sitting in the last row of the classroom is not able to read clearly the writing on the blackboard. Name the lens used to correct this defect.

(Choose from Concave lens, Convex lens, Cylindrical lens)