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Q.1 2. માનવ-આંખ પોતાના આ ભાગ પર પ્રતિબિંબ રચે છે.
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Q.2 4. આંખના લેન્સની કેન્દ્રલંબાઈમાં ફેરફાર કોણ કરે છે ?
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Q.3 3. સામાન્ય દૃષ્ટિ ધરાવતી પુખ્ત વ્યક્તિ માટે સ્પષ્ટ દૃષ્ટિઅંતર આશરે કેટલું છે ?
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Q.4 1. આંખના લેન્સની કેન્દ્રલંબાઈમાં ફેરફાર કરીને માનવ-આંખ વિવિધ અંતરે રાખેલી વસ્તુઓને સ્પષ્ટ જોઈ શકે છે. આવું .....ને લીધે થાય છે.