SELECT * FROM question_mgmt as q WHERE id=3781 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=262 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science The Human Eye and the Colourful World why is a normal eye not able to see clearly the ob

Question:

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

Answer:

The normal eye not able to see the objects very clearly that is placed closer than 25 cm because to see the nearest objects within the range before 25 cm, ciliary muscles should be contracted, suspensory ligament should be in the relaxed state, lens should be thick or more convex (increase in the thickness of lens, focal length get short that is adjusted for focusing on the near objects very clearly) and refraction should be increased to see clear image. And, the too much contraction of the ciliary muscles cause stress on the eyes. Thus, the normal eye is unable to see the objects placed closer than 25cm.


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