Advertisements
Advertisements
Question
The magnification by a lens is -3. Name the lens and state how are u and v related?
Advertisements
Solution
The negative value of magnification suggests that image is real and inverted. The magnitude of magnification is greater than 1 which means image is enlarged. Therefore the lens should be convex lens.
Relation between u and v is given by
m = `"v"/"u"`
`-3 = "v"/-"u"`
v = 3 u
This shows that image distance is 3 times that of object distance.
RELATED QUESTIONS
A lens forms an erect, magnified, and virtual image of an object. Where is the object placed in relation to the lens?
A lens forms an erect, magnified and virtual image of an object. Draw a ray diagram to show the formation of image.
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 -?
If the magnification produced by a lens is - 0.5, the correct statement is ______.
Define the term magnifying power of a simple microscope. How does it depend on the focal length of the lens used?
Why is the focal length of the lens, used as a magnifying glass, kept short?
Define magnification produced by a lens. State its unit.
How is the magnification (m) produced by a lens related to the object distance (u) and the image distance (v)?
Draw a neat diagram to explain the action of a convergent (convex) lens as a reading glass (or magnifying glass). State the characteristics of the image formed.
