Advertisements
Advertisements
प्रश्न
A lens forms an erect, magnified, and virtual image of an object. Name the device which uses this principle.
Advertisements
उत्तर
'Magnifying glass' uses this principle.
APPEARS IN
संबंधित प्रश्न
Where is the object placed with respect to the principal focus of a magnifying glass, so as to see its enlarged image? Where is the image obtained?
What information about the nature of image is real or virtual, do you get from the sign of magnification + or -?
The focal length of a convex lens is 25 cm. At what distance from the optical centre of the lens an object be placed to obtain a virtual image of twice the size?
Why is the focal length of the lens, used as a magnifying glass, kept short?
What information we seek by the linear magnification of the image when it is positive or negative?
How is the magnification (m) produced by a lens related to the object distance (u) and the image distance (v)?
An object is placed in front of a lens between its optical centre and the focus and forms a virtual, erect, and diminished image. Draw a ray diagram to show the formation of the image with the above-stated characteristics.
What is a simple microscope or a magnifying glass? Draw a ray diagram to show its function.
An object AB is placed between 2F1 and F1 on the principal axis of a convex lens as shown in the diagram. Copy the diagram and using three rays starting from point A, obtain the image of the object formed by the lens.
(i) Draw a ray diagram to show how the lens can be used as a ‘magnifying glass’? State the nature of the lens.
(ii) In what respect does the image in (i) above different from the image formed by a concave lens?
