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प्रश्न
Choose the correct answer :
Presbyopia is a disease of _____________
विकल्प
ear
nose
mouth
eye
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उत्तर
Presbyopia is a disease of eye
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संबंधित प्रश्न
A student suffering from myopia is not able to see distinctly the objects placed beyond 5 m. List two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams, explain
(i) why the student is unable to see distinctly the objects placed beyond 5 m from his eyes.
(ii) the type of the corrective lens used to restore proper vision and how this defect is corrected by the use of this lens.
(b) If, in this case, the numerical value of the focal length of the corrective lens is 5 m, find the power of the lens as per the new Cartesian sign convention
What is the scientific name of
long-sightedness?
Name the defect of vision which can be corrected by a diverging lens. Show clearly by a ray diagram how the lens corrects the defect.
Differentiate between members of the following pair with reference to what is asked in bracket.
Myopia and hyperopia (cause of the defect)
Choose the odd one out from the following terms and name the category to which the others belong.
Endolymph, Tympanic membrane, Semi-circular canal, Blind spot
Give Reason:
Why do we see clearly in the central region of the retina?
What type of lens is used to correct Astigmatism?
Myopia and hypermetropia can be corrected by:
Which of the following statement is correct?
Name the following:
Two kinds of accomodations.
