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A student obtained a sharp image of the grills of a window on a screen using a concave mirror. His teacher remarked that for getting better results a well lit distance object (preferably the Sun) should be focused on the screen. What should be done for this purpose?- Move the screen and the mirror towards the object
- Move the screen and the mirror away from the object
- Move the screen slightly away from the mirror
- Move the mirror slightly towards the screen
(d) Move the mirror slightly towards the screen
Explanation
To get the sharp image of a distant object (or, the object at infinity), the mirror should be adjusted so that the image will form at the focus $F$ or at the focal distance $f$ of the mirror. Because we know that when an object is at infinity or at a considerable distance, then the image forms at the focus, $F$ of the mirror. The nature of the image is real, inverted, and highly diminished.
Thus, a sharp image can be obtained, only when the screen will be at the distance of focal length $f$ of the mirror. Therefore, the mirror should be slightly moved towards the screen.
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