উত্তল লেন্স থেকে 2f দূরত্বে বস্তু স্থাপন করলে উৎপন্ন বিবর্ধন 'm' হলো:

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RRB Group D 22 Aug 2022 Shift 1 Official Paper
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  1. m = +1
  2. m = -1
  3. m = -2
  4. m = +2

Answer (Detailed Solution Below)

Option 2 : m = -1
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সঠিক উত্তরটি হল m = -1.

প্রদত্ত:

বস্তুর দূরত্ব \(u=2f\)

নির্ণয় করতে হবে: বিবর্ধন "m"

সূত্র:

লেন্সের বিবর্ধন m= v/u

গণনা:

এখানে, যখন উত্তল লেন্সের 2f দূরত্বে বস্তু স্থাপন করা হয় তখন একই অবস্থানে 2f-এ সদ ও উল্টো প্রতিবিম্ব তৈরি হবে।

তাই প্রতিবিম্বের দূরত্ব2f

অতএব,

লেন্সের বিবর্ধন হল:

m= v/u = 2f/-2f=-1

অতএব বিবর্ধন -1.

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