6 సెం.మీ వ్యాసం కలిగిన ఒక వస్తువు లెన్స్ ముందు 10 సెం.మీ దూరంలో +5.0 D శక్తితో ఉంచబడుతుంది. వస్తువు యొక్క చిత్రం యొక్క వ్యాసం ఎలా ఉంటుంది?

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RRB Group D 17 Sept 2022 Shift 3 Official Paper
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  1. 12 సెం.మీ
  2. 10 సెం.మీ
  3. 8 సెం.మీ
  4. 14 సెం.మీ

Answer (Detailed Solution Below)

Option 1 : 12 సెం.మీ
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Detailed Solution

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సరైన సమాధానం ఎంపిక 1)12cm

ఇవ్వబడింది:

లెన్స్ యొక్క శక్తి +5.0 D.

సూత్రం:

లెన్స్ పవర్:

లెన్ సూత్రం:

గణనలు:

\(P={1\over f}\)

\(f={1\over P}={1\over5}=0.2m=20cm\)

\({1\over f}={1\over v}-{1\over u}\)

\({1\over 20}={1\over v}-{1\over -10}\)

\({1\over v}={1\over 20}+{1\over -10}={1-2\over20}\)

\(v={-20\over 1}=-20cm\)

లెన్స్ యొక్క మాగ్నిఫికేషన్ మనకు తెలుసు:

\(m={di\over do}={v\over u}\)

\({di\over 6}={-20\over -10}=2\)

\(di=6*2=12cm\)

కాబట్టి, చిత్రం యొక్క వ్యాసం 12 సెం.మీ.

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