Questions
The image produced by a concave mirror is one-quarter the size of object. If the object is moved 5 cm closer to the mirror, the image will only be half the size of the object. The focal length of mirror is
detailed solution
Correct option is B
In first case, if object distance is x, image distance = x/4. While it is 2nd case, object distance becomes (x - 5 cm) and image distance (x - 5 cm)/2. Using mirror formula, we get.In first case, 1f=-5xIn second case, 1f=-3x-5Solving we get, x = 12.5 cm and f = - 2.5 cm and hence |f| = 2.5 cmTalk to our academic expert!
Similar Questions
The image of an object placed on the principal axis of a concave mirror of focal length 12 cm is formed at a point which is 10 cm more distance from the mirror than the object. The magnification of the image is
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