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Question
Why are the mirrors fitted on the outside of cars convex?
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Solution
- The image formed by a convex mirror is small and straight.
- This image remains straightforward; But as we move the mirror further away from the object, the image becomes smaller.
- As a result, we see all the surrounding images in the mirror.
- The use of convex mirrors in the outside of the vehicle gives the driver a straight, narrow and clear image of the vehicles behind the vehicle.
- Therefore, the mirror fitted on the outside of the vehicle is convex.
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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.
An object is placed at a distance of 40 cm in front of a convex mirror of radius of curvature 40 cm. List four characteristics of the image formed by the mirror.
If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, state the type of the mirror and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why.
What is the nature of a mirror having a focal length of, +10 cm?
A mirror forms an image which is 30 cm from an object and twice its height.
(a) Where must the mirror be situated?
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An object is placed at a long distance in front of a convex mirror of radius of curvature 30 cm. State the position of its image.
Name the mirror which can give:
an erect and diminished image of an object.
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A ray of light of going towards the focus of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation.
Why can you not use a concave mirror as a rear-view mirror in vehicles?
Give two uses of a convex mirror. Explain why you would choose convex mirror for these uses.
If a driver has one convex and one plane rear-view mirror, how would the images in each mirror appear different?
Whatever be the position of the object, the image formed by a mirror is virtual, erect and smaller than the object. The mirror then must be:
(a) plane
(b) concave
(c) convex
(d) either concave or convex
An object is placed at a distance of 10 cm from a convex mirror of focal length 5 cm.
(a) Draw a ray-diagram showing the formation image
(b) State two characteristics of the image formed
(c) Calculate the distance of the image from mirror.
A shop security mirror 5.0 m from certain items displayed in the shop produces one-tenth magnification.
- What is the type of mirror?
- What is the radius of curvature of the mirror?
The magnification produced by a spherical mirror and a spherical lens is + 0.8.
(a) The mirror and lens are both convex
(b) The mirror and lens are both concave
(c) The mirror is concave but the lens is convex
(d) The mirror is convex but the lens is concave
A convex mirror is used
An object at a distance of +15 cm is slowly moved towards the pole of a convex mirror. The image will get ______.
Magnification produced by a rear view mirror fitted in vehicles
