{"id":333307,"date":"2023-01-06T02:34:40","date_gmt":"2023-01-05T21:04:40","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/question\/a-concave-mirror-of-a-focal-length-of-20-cm-forms-an-image-twice-the-size-of-the-object-for-the-virtual-position-of-the-image-the-position-of-the-object-will-be-at\/"},"modified":"2025-06-26T17:55:16","modified_gmt":"2025-06-26T12:25:16","slug":"a-concave-mirror-of-a-focal-length-of-20-cm-forms-an-image-twice-the-size-of-the-object-for-the-virtual-position-of-the-image-the-position-of-the-object-will-be-at","status":"publish","type":"questions","link":"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-concave-mirror-of-a-focal-length-of-20-cm-forms-an-image-t\/","title":{"rendered":"A concave mirror of a focal length of 20 cm forms an image twice the size of the object. For the virtual position of the image, the position of the object will be at"},"content":{"rendered":"","protected":false},"author":1,"template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"A concave mirror of a focal length of 20 cm forms an image twice the size of the object. For the virtual position of the image, the position of the object will be at","custom_permalink":"question\/physics\/a-concave-mirror-of-a-focal-length-of-20-cm-forms-an-image-t\/"},"categories":[],"acf":{"question":"

A concave mirror of a focal length of 20 cm forms an image twice the size of the object. For the virtual position of the image, the position of the object will be at<\/span><\/p>","options":[{"option":"

40 cm<\/span><\/p>","correct":false},{"option":"

25 cm<\/span><\/p>","correct":false},{"option":"

10 cm<\/span><\/p>","correct":true},{"option":"

At infinity<\/span><\/p>","correct":false}],"solution":"

For virtual image,<\/span><\/p>

m<\/mi>=<\/mo>-<\/mo>v<\/mi>u<\/mi><\/mfrac>=<\/mo>+<\/mo>2<\/mn>\u21d2<\/mo>v<\/mi>=<\/mo>-<\/mo>2<\/mn>u<\/mi><\/math><\/p>

1<\/mn>u<\/mi><\/mfrac>+<\/mo>1<\/mn>v<\/mi><\/mfrac>=<\/mo>1<\/mn>f<\/mi><\/mfrac><\/math><\/p>

\u2234<\/mo>  <\/mo>1<\/mn>u<\/mi><\/mfrac>+<\/mo>1<\/mn>-<\/mo>2<\/mn>u<\/mi><\/mrow><\/mfrac>=<\/mo>1<\/mn>-<\/mo>20<\/mn><\/mrow><\/mfrac><\/math><\/p>

\u21d2<\/mo>  <\/mo>1<\/mn>2<\/mn>u<\/mi><\/mrow><\/mfrac>=<\/mo>1<\/mn>-<\/mo>20<\/mn><\/mrow><\/mfrac><\/math><\/p>

\u21d2<\/mo>  <\/mo>u<\/mi>=<\/mo>-<\/mo>10<\/mn> <\/mo>cm<\/mi><\/math><\/p>","subject":""},"yoast_head":"\nA concave mirror of a focal length of 20 cm forms an image twice the size of the object. For the virtual position of the image, the position of the object will be at - Infinity Learn by Sri Chaitanya<\/title>\n<meta name=\"description\" content=\"A concave mirror of a focal length of 20 cm forms an image twice the size of the object. 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