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Question
A convex mirror is used
Options
as a shaving mirror
as a head mirror by a dentist
as a rear view mirror by a driver
as a reflector in torch
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Solution
A convex mirror is used as a rear view mirror by a driver.
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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:
at infinity?
Draw labelled ray-diagrams to show the formation of image in both the case.
What happens to the image when the object is moved away from the mirror gradually?
A shop security mirror 5.0 m from certain items displayed in the shop produces on-tenth magnification.
What is the type of mirror?
Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed:
- at 2F1,
- between F₁ and the optical centre O of the lens.
Which of the above two cases shows the use of a convex lens as a magnifying glass? Give reasons for your choice.
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
Write true or false
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
The focal length of a convex mirror is equal to its radius of curvature.
The Convex mirror always forms ______ and ______ image.
The image formed by these mirrors is ______ than the object.
