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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.
Define the following term in the context of spherical mirrors:- Centre of curvature
Explain the following term related to spherical lenses:- centres of curvature
Explain the following term related to spherical lenses:- principal focus
Explain the following term related to spherical lenses: focal length
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. |
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?
Write the mirror formula. Give the meaning of each symbol which occurs in it.
A diverging lens is used in ______.
If a spherical mirror breaks, what type of mirrors are the individual pieces?
Complete the following diagrams shown in Fig. by drawing the reflected ray for each of the incident ray A and B.
State the position of object for which the image formed by a concave mirror is of same size.
Answer the following question.
Write the modification in the curvature of the eye lens which enables us to see the nearby objects clearly?
Select the correct option:
Which mirror is used in periscope?
Define the following term in relation to concave mirror.
Radius of curvature
What is the relationship between the focal length and radius of curvature?
An object is placed in front of a concave mirror as shown in the following figure. By scale drawing, find the nature of the image. Given f = 10 cm, v = 30 cm.
Define focal length.
In torches, search lights and headlights of vehicles the bulb is placed ______.
Spherical mirrors are one form of ______ mirrors.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
What is the focal length (f) of a mirror?
