छींक आने पर ऑखें बंद क्u200dयों हो जाती है, Why is the Eyes Closed When Sneezing #shorts #facts

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?

A certain sum amounts to Rs 29282 in 4 years at 10% per annum, when the interest is compounded annually. What is the simple interest on the same sum for same time at the same rate? निश्चित राशि 10% प्रति वर्ष की दर से 4 वर्षों में 29282 रुपये हो जाती है, जब ब्याज की चक्रवृद्धि वार्षिक है | इसी राशि पर इसी दर से इतने ही समय का साधारण ब्याज ज्ञात करें |

If a sum amounts to Rs2,190 in four years and Rs 2,409 in five years at compound interest, when the interest is compounded yearly, then the annual rate of interest is: यदि कोई राशि चक्रवृद्धि ब्याज पर चार वर्षों में 2190 रुपये तथा पांच वर्षो में 2409 रुपये हो जाती है, जब ब्याज की चक्रवृद्धि वार्षिक है, तो ब्याज की वार्षिक दर ज्ञात करें |

A sum amounts to Rs 8,028 in 3 years and to Rs 12,042 in 6 years at a certain rate percent per annum, when the interest is compounded yearly. The sum is: कोई राशि ब्याज की वार्षिक चक्रवद्धि पर प्रति वर्ष एक निश्चित दर से 3 वर्षों में 8028 रुपये तथा 6 वर्षों में 12042 रुपये हो जाती है | यह राशि है :

A man takes a loan of some amount at some rate of simple interest. After three years, the loan amount is doubled and the rate of interest decreased by 2%. After 5 years, if the total interest paid on the whole is Rs13,600, which is equal to the same when the first amount was taken for 11 1/3 years, then the loan taken initially is: एक आदमी साधारण ब्याज की कुछ दर पर कुछ राशि का ऋण लेता है। तीन साल के बाद, ऋण की राशि दोगुनी हो जाती है और ब्याज की दर 2% कम हो जाती है। 5 साल के बाद, यदि पूरे पर दिया गया कुल ब्याज 13,600 रुपये है, जो उसी के बराबर है जब पहली राशि 11 1/3 वर्षों के लिए उधार ली गई थी, तो शुरू में लिया गया ऋण है:

A sum invested at 8% p.a. amounts to Rs 20280 at the end of one year, when the interest is compounded half yearly. What will be the simple interest on the same sum for 4 3/5 years at double the earlier rate of interest? 8% प्रति वर्ष की दर से निवेश की गयी कोई राशि पहले वर्ष के अंत में 20280 रुपये हो जाती है, जब ब्याज की चक्रवृद्धि अर्धवार्षिक है | इस राशि पर पहले की तुलना में ब्याज की दोगुनी दर से 4 3/5 वर्षों का साधारण ब्याज क्या होगा ?