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प्रश्न
The distance between an object and a convex lens is changing. It is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?
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उत्तर
In the case of a convex lens, as the object moves away from it, the size of the image formed on a screen decreases.
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संबंधित प्रश्न
If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, state the type of the mirror and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why.
In a convex spherical mirror, reflection of light takes place at:
(a) a flat surface
(b) a bent-in surface
(c) a bulging-our surface
(d) an uneven surface
Give two uses of a convex mirror. Explain why you would choose convex mirror for these uses.
Light travels in the same straight line path while passing through different media.
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
Write true or false
The focal length of a convex mirror is equal to its radius of curvature.
State two uses of a convex mirror.
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Identify the device used as a spherical mirror or lens in following case, when the image formed is virtual and erect in case.
Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.
Which type of mirror is used in the following?
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