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Question
If you want to see an enlarged image of your face, state whether you will use a concave mirror or a convex mirror?
Solution
To see an enlarged image of our face, we use a concave mirror. This is because when an object is extremely close to a concave mirror, it forms a virtual, erect and enlarged image. Whereas, in a convex mirror, the image formed is virtual, erect and smaller than the object.
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RELATED QUESTIONS
Analyse the following observation table showing variation of image distance (v) with object distance (u) in case of a convex lens and answer the questions that follow, without doing any calculations:
| S. No. | Object distance u(cm) | Image distance v(cm) |
| 1 | −90 | +18 |
| 2 | −60 | +20 |
| 3 | −30 | +30 |
| 4 | −20 | +60 |
| 5 | −18 | +90 |
| 6 | −10 | +100 |
(a) What is the focal length of the convex lens? Give reason in support of your answer.
(b) Write the serial number of that observation which is not correct. How did you arrive at this conclusion?
(c) Take an appropriate scale to draw ray diagram for the observation at S. No. 4 and find the approximate value of magnification.
Where would the image be formed by a convex mirror if the object is placed:
between infinity and pole of the mirror?
Draw labelled ray-diagrams to show the formation of image in both the case.
How will you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them?
Draw diagram to show how a convex mirror can be used to give a large field of view.
The image formed by a spherical mirror is virtual. The mirror will be:
(a) concave
(b) convex
(c) either concave or convex
(d) metallic
An object is placed at a distance of 6 cm from a convex mirror of focal length 12 cm. Find the position and nature of the image.
An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how the image is formed, and say whether the image is real or virtual.
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
State two uses of a convex mirror.
The nature of image formed by a convex mirror when the object distance from the mirror is less than the distance between pole and focal point (F) of the mirror would be ______.
