Light - Reflection and Refraction — Flashcards
Madhya Pradesh Board · Class 10 · Science
70 flashcards for Light - Reflection and Refraction (Madhya Pradesh Board Class 10 Science) to test yourself on key terms and facts.
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What is the principal focus of a concave mirror?
Answer
The principal focus is the point on the principal axis where rays parallel to the principal axis meet after reflection from a concave mirror.
अवतल दर्पण का मुख्य फोकस क्या होता है?
Answer
मुख्य फोकस मुख्य अक्ष पर वह बिंदु है जहाँ मुख्य अक्ष के समानांतर किरणें अवतल दर्पण से परावर्तन के बाद मिलती हैं।…
What is the principal focus of a convex mirror?
Answer
It is the point on the principal axis from which rays parallel to the principal axis appear to diverge after reflection.
उत्तल दर्पण का मुख्य फोकस क्या होता है?
Answer
यह मुख्य अक्ष पर वह बिंदु है जिससे मुख्य अक्ष के समानांतर किरणें परावर्तन के बाद अपसारित होती हुई प्रतीत होती हैं।…
Why is a convex mirror used as a rear-view mirror in vehicles?
Answer
A convex mirror is preferred because it always gives an erect, though diminished, image and has a wider field of view. This helps the driver see a larger area behind the vehicle.
वाहनों में पीछे देखने वाले दर्पण के रूप में उत्तल दर्पण का उपयोग क्यों किया जाता है?
Answer
उत्तल दर्पण को इसलिए पसंद किया जाता है क्योंकि यह हमेशा सीधा, यद्यपि छोटा, प्रतिबिंब देता है और देखने का क्षेत्र अधिक चौड़ा होता है। इससे चालक वाहन के पीछे का बड़ा क्षेत्र देख सकता है।…
A spherical mirror has radius of curvature 20 cm. What is its focal length?
Answer
Use R = 2f. So, f = R/2 = 20 cm / 2 = 10 cm. For a concave mirror, this is taken as negative in sign convention; for a convex mirror, it is positive.
एक गोलाकार दर्पण की वक्रता त्रिज्या 20 cm है। उसकी फोकस दूरी क्या है?
Answer
R = 2f का उपयोग करें। अतः, f = R/2 = 20 cm / 2 = 10 cm। अवतल दर्पण के लिए, संकेत परंपरा में इसे ऋणात्मक माना जाता है; उत्तल दर्पण के लिए, यह धनात्मक होता है।…
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