$A$ man is suffering from colour blindness for green colour. To remove this defect,he should use goggles of
- AGreen colour glasses
- BRed colour glasses
- CSmoky colour glasses
- DNone of the above
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Similar Questions
$A$ man with defective eyes cannot see objects distinctly at a distance of more than $60 \, cm$ from his eyes. The power of the lens to be used will be:
Medium
View SolutionWhen the power of the eye lens increases,a defect of vision is produced. This defect is known as:
Easy
View SolutionIf the least distance of distinct vision for a boy is $35 \ cm$,then the lens to be used by the boy for correcting the defect of his eye is
$A$ person cannot see objects clearly placed at a distance of more than $40 \, cm$. He is advised to use a lens of power:
Easy
View SolutionMatch the List-$I$ with the List-$II$ from the combinations shown:
$(I)$ Presbyopia $(A)$ Sphero-cylindrical lens $(II)$ Hypermetropia $(B)$ Convex lens of proper power may be used close to the eye $(III)$ Astigmatism $(C)$ Concave lens of suitable focal length $(IV)$ Myopia $(D)$ Bifocal lens of suitable focal length
| $(I)$ Presbyopia | $(A)$ Sphero-cylindrical lens |
| $(II)$ Hypermetropia | $(B)$ Convex lens of proper power may be used close to the eye |
| $(III)$ Astigmatism | $(C)$ Concave lens of suitable focal length |
| $(IV)$ Myopia | $(D)$ Bifocal lens of suitable focal length |
Medium
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