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Question
A ray of light passing through centre of curvature of a spherical mirror, after reflection
Options
passes through the focus
passes through the pole
becomes parallel to the principal axis
retraces its own path.
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Solution
retraces its own path.
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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.
A mirror forms an image which is 30 cm from an object and twice its height.
(a) Where must the mirror be situated?
(b) What is the radius of curvature?
(c) Is the mirror convex or concave?
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.
What happens to the image when the object is moved away from the mirror gradually?
The radius of curvature of a convex mirror used as a rear view mirror in a moving car is 2.0 m. A truck is coming from behind it at a distance of 3.5 m. Calculate
- position and
- size of the image relative to the size of the truck.
- What will be the nature of the image?
Name two factors on which the focal length of a lens depends.
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
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 ______.
A convex rearview mirror is preferred over a plane mirror in a car. Why?
The image formed by a convex mirror is always ______.
