Table of Contents
- 1 What happens when object distance is equal to focal length?
- 2 What is the image formed when the object is place within the focal length of a concave mirror?
- 3 What happens when the object distance is less than the focal length?
- 4 What is U and V in ray optics?
- 5 What is focal length of a convex mirror?
- 6 How do you find the focal length of a convex mirror?
- 7 What are the characteristics of the image formed by a convex mirror?
- 8 What is the principal focus of a concave and convex lens?
What happens when object distance is equal to focal length?
Finally, when the object distance is equal to exactly one focal length, there is no image. Then altering the object distance to values less than one focal length produces images that are upright, virtual and located on the same side of the lens as the object.
What is the image formed when the object is place within the focal length of a concave mirror?
virtual image
A plane mirror will always produce a virtual image. A concave mirror will only produce a virtual image if the object is located in front of the focal point.
When object is placed at focal length in convex mirror the image is formed at?
As is easily demonstrated, in the paraxial approximation, the focal length of a convex mirror is half of its radius of curvature. Figure 74: The virtual focus of a convex mirror….Image Formation by Convex Mirrors.
| Position of object | Position of image | Character of image |
|---|---|---|
| At | At | Virtual, upright, same size |
What kind of image is formed when an object is placed between the focal point?
A virtual image will be formed behind the concave mirror if the object is placed between pole and focus of the mirror.
What happens when the object distance is less than the focal length?
That is, what if the object distance is smaller than the focal length? The image will be on the same side of the lens from the object, and will be upright. The image will also be larger than the object. That means that the image distance will be negative.
What is U and V in ray optics?
The distance of the object from its pole is called the object distance (u). The distance of the image from the pole of the mirror is called the image distance (v). The distance of the principal focus from the pole is called the focal length (f).
How does the image formed by the object inside the focus differ from the image of the object outside the focus?
Objects Between the Center Point and the Focal Point We already know that the image of an object outside the center point is closer and smaller than the object. When an object is between the center point and the focal point, the image is larger and closer.
When object is kept at a distance less than its focal length?
When the object is kept at a distance less than its focal length, an upright, magnified image is formed behind the mirror. A concave mirror can form an image larger than the actual object when the object is placed between the focus and centre of curvature.
What is focal length of a convex mirror?
The focal length of a convex mirror is its radius of curvature.
How do you find the focal length of a convex mirror?
You can measure the radius of curvature (R) of the mirror by measuring the distance between convex mirror and the screen placed behind the mirror. You can calculate the focal length of the mirror using the equation f = R/2.
What type of image is formed when an object is placed between the focal point and vertex of the mirror?
Such images are called virtual images because they are not formed by the actual convergence of reflected light rays at the image location. Virtual images are always formed on the opposite side of the mirror as the object.
What kind of image is formed by convex mirror?
virtual and erect
Image formed by a convex mirror is always virtual and erect. When an object is placed at infinity, virtual image is formed at focus and the size of the image is smaller.
An object is at a distance of 50 cm from the convex mirror, and its focal length is 23 cm. Image Distance (d i) = 1/ ((1/f) – (1/d o)) = 1/ ((1/23) – (1/50)) = 42.5926 cm. You can also calculate focal length, image and object distance alternatively with the other known values.
What are the characteristics of the image formed by a convex mirror?
Another characteristic of the images of objects formed by convex mirrors pertains to how a variation in object distance affects the image distance and size.
What is the principal focus of a concave and convex lens?
For a concave mirror, the principal focus is in the front and for a convex mirror, the principal focus is at the behind. Below is an experiment to determine the focal length of a concave mirror and convex lens.
What happens to the image when an object approaches a mirror?
The diagram shows that as the object distance is decreased, the image distance is decreased and the image size is increased. So as an object approaches the mirror, its virtual image on the opposite side of the mirror approaches the mirror as well; and at the same time, the image is becoming larger.