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13. A thin lens and a spherical mirrorhave a focal length of +15cm each.​

Answer» <html><body><p><strong><a href="https://interviewquestions.tuteehub.com/tag/explanation-455162" style="font-weight:bold;" target="_blank" title="Click to know more about EXPLANATION">EXPLANATION</a>:</strong></p><p>a)</p><p>Both are <a href="https://interviewquestions.tuteehub.com/tag/convex-933348" style="font-weight:bold;" target="_blank" title="Click to know more about CONVEX">CONVEX</a>.</p><p>b)</p><p>The <a href="https://interviewquestions.tuteehub.com/tag/lens-1071845" style="font-weight:bold;" target="_blank" title="Click to know more about LENS">LENS</a> is convex and the <a href="https://interviewquestions.tuteehub.com/tag/mirror-1098189" style="font-weight:bold;" target="_blank" title="Click to know more about MIRROR">MIRROR</a> is <a href="https://interviewquestions.tuteehub.com/tag/concave-927978" style="font-weight:bold;" target="_blank" title="Click to know more about CONCAVE">CONCAVE</a>.</p><p>c)</p><p>The lens is concave and the mirror is convex.</p><p>d)</p><p>Both are concave.</p></body></html>


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