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An object is kept on the principal axis of a concave mirror of focal length 12 cm. If the object is at a distance of 18 cm from the mirror, calculate then image distance. Determine the nature of the image formed by calculatingthe magnification produced by the mirror, |
| Answer» <html><body><h3><u>Given :-</u><u> </u></h3><p></p><ul><li><a href="https://interviewquestions.tuteehub.com/tag/focal-2648683" style="font-weight:bold;" target="_blank" title="Click to know more about FOCAL">FOCAL</a> length = - 12cm</li><li>Object distance = - 18cm</li></ul><p></p><h3><u>To <a href="https://interviewquestions.tuteehub.com/tag/find-11616" style="font-weight:bold;" target="_blank" title="Click to know more about FIND">FIND</a></u><u> </u><u>:</u><u>-</u></h3><p></p><ul><li>Image distance </li><li>Nature of image</li><li><a href="https://interviewquestions.tuteehub.com/tag/magnification-1083057" style="font-weight:bold;" target="_blank" title="Click to know more about MAGNIFICATION">MAGNIFICATION</a></li></ul><p></p><h3><u>Solution :-</u><u> </u></h3><p></p><p><strong>Apply</strong><strong> </strong><strong>mirror</strong><strong> </strong><strong>formula</strong></p><p></p><p>→ 1/v + 1/u = 1/f</p><p></p><p>→ 1/v + (-1)/18 = -1/12</p><p></p><p>→ 1/v = 1/18 - 1/12</p><p></p><p>→ 1/v = <a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a> - 3/36</p><p></p><p>→ 1/v = -1/36</p><p></p><p>→ v = - 36cm</p><p></p><p><strong>Hence</strong><strong>,</strong></p><ul><li><strong> </strong>Image Distance is -36cm</li><li>Nature of image = <a href="https://interviewquestions.tuteehub.com/tag/real-1178490" style="font-weight:bold;" target="_blank" title="Click to know more about REAL">REAL</a> and inverted </li></ul><p></p><p></p><p><strong>★</strong><strong> </strong><strong>Magnification</strong><strong> </strong><strong>of</strong><strong> </strong><strong>mirror</strong><strong> </strong><strong>★</strong></p><p></p><p>→ m = -v/u = hi/ho</p><p></p><p>→ m = -v/u</p><p></p><p>→ m = -(-36)/-18</p><p></p><p>→ m = -36/18</p><p></p><p>→ m = - 2</p><p></p><p><strong><u>Hence</u></strong><strong><u>,</u></strong><strong><u> </u></strong></p><p></p><ul><li>Magnification of mirror is - 2</li></ul><p></p></body></html> | |