A convex lens produces an image of an object on a screen with a magnification of . When the lens is moved 30 cm away from the object, the magnification of the image is 2. The focal length of the lens is |
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(a) |
20 cm |
(b) |
25 cm |
(c) |
30 cm |
(d) |
35 cm |

A convex lens produces an image of an object on a screen with a magnification of . When the lens is moved 30 cm away from the object, the magnification of the image is 2. The focal length of the lens is |
|||||||

(a) |
20 cm |
(b) |
25 cm |
(c) |
30 cm |
(d) |
35 cm |

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