हम बार बार पलकें क्यों झपकाते हैं | Why Our Eyes Blink | Amazing Facts About Eyes | #shorts

a) The anlge subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provide angular magnifications? b) In viewing through a magnifying glass, one usually positions one's eyes very close to the lens. Does angular magnification change if the eye is moved back? c) Magnifying power of a simple microscopes is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power? d) Why must both the objective and the eyepiece of a compound microscope have short focal lengths? e) When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it fot best veiwing. Why? How much should be that short distance between the eye and eyepiece?

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select ‘No Error’. We may only be here in the blink of an eye, (1)/ but the way we live our lives will stay (2)/ with the universe forever. (3)/ No error (4)