Advertisements
Advertisements
प्रश्न
A lens forms an upright and diminished image of an object, irrespective of its position. What kind of lens is this? Draw an outline ray diagram to show the formation of the image. State the position and one more characteristic of the image.
Advertisements
उत्तर
A concave (or diverging) lens forms an upright and diminished image of an object irrespective of its position.
The outline ray diagram showing the formation of the image is given in figure. For the object AB, the image is A’B’.
The image is formed between optical centre O and focus F, in front of the lens.
The image is virtual.
संबंधित प्रश्न
What is meant by a power of a lens? Define its SI unit.
State power of a lens S.I. unit.
What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.
Give the usual name for the following:
A point inside a lens through which the light passes undeviated.
State the condition for the following a lens has both its focal lengths equal .
How does the power of a lens change if its focal length is doubled?
Focal length : metre : : power of lens : _______
The power of the magnifying glass depends on the distance of the magnifying glass from object.
The above lens has a focal length of 10 cm. The object of height 2 mm is placed at a distance of 5 cm from the pole. Find the height of the image.
In what unit is the power of a lens expressed?
