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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
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
What is the nature of a mirror having a focal length of, +10 cm?
Which mirror always produces a virtual, erect and diminished image of an object?
An object placed 20 cm in front of a mirror is found to have an image 15 cm (a) in front of it, (b) behind the mirror. Find the focal length of the mirror and the kind of mirror in each case.
Write true or false
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
A .............. mirror is obtained on silvering the outer surface of a part of a hollow glass sphere.
A convex mirror is used
State two uses of a convex mirror.
The most common example of a convex mirror is the make – up mirror.
Higher-Order Thinking Skills:
A convex mirror is in water. What should be the change in its focal length?
