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प्रश्न
What is a virtual image?
What are virtual images?
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उत्तर
When the rays of light reflecting from an object appear to meet in a virtual form, then the images formed in this way are called virtual images.
संबंधित प्रश्न
A simple microscope is used by watch repairers. Give reason.
A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X).
Explain the following term related to spherical lenses:- principal focus
Match the items given in Column I with one or more items of Column II.
| Column I | Column II | ||
| (a) | A plane mirror | (i) | Used as a magnifying glass. |
| (b) | A convex mirror | (ii) | Can form image of objects spread over a large area. |
| (c) | A convex lens | (iii) | Used by dentists to see enlarged image of teeth. |
| (d) | A concave mirror | (iv) | The image is always inverted and magnified. |
| (e) | A concave lens | (v) | The image is erect and of the same size as the object. |
| (vi) | The image is erect and smaller in size than the object. |
Define the Focal length of a spherical mirror
The letter F is placed in front of a plane mirror:
What is the name of the phenomenon involved?
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
At which point of the spherical mirror the carbon paper is placed?
Which are the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain with the help of suitable ray diagrams.
Name the kind of mirror used to obtain
(a) a real and enlarged image
(b) a virtual and enlarged image
(c) a real and diminished image, and
(d) a virtual and diminished image.
If a spherical mirror breaks, what type of mirrors are the individual pieces?
Three mirrors are created from a single sphere. Which of the following - pole, centre of curvature, radius of curvature, principal axis - will be common to them and which will not be common?
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
For what position of object, the image formed by a concave mirror is magnified and erect?
Write two more characteristics of the image.
Write the spherical mirror's formula and explain the meaning of each symbol used in it.
State the kind of mirror used
(a) By a dentist,
(b) As a search-light reflector.
The image formed by a convex mirror is
At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.
Define the following term in relation to concave mirror.
Principal axis
Define the following term in relation to concave mirror.
Focal length
AB is the object, A'B' is the image, and MM' is the position of the mirror. Complete the ray diagram showing the formation of the image and find the focal length of the mirror.
The following figure shows a concave mirror with its pole (P), focus (F), and center of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave mirror.
Draw a ray diagram to show that a convex mirror has a wider field of view.
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
