RRB Group D previous year question
The point on the principal axis where rays parallel to the principal axis converge (or appear to diverge) after reflection from a mirror is called which of the following?
Asked in RRB Group D CBT-1: 08 Jan 2026 Shift 1 · Science
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Correct answer: (B) Principal focus
By definition, the principal focus is where parallel rays converge (or appear to diverge) after reflection.
हिंदी में प्रश्न
मुख्य अक्ष पर वह बिंदु जहाँ मुख्य अक्ष के समानांतर किरणें दर्पण से परावर्तन के बाद अभिसरित होती हैं (या अपसरित होती हुई प्रतीत होती हैं), निम्नलिखित में से क्या कहलाता है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) द्वारक
सही उत्तर: विकल्प B (द्वारक)
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