What is the sign convention to be taken while solving problems related to image or object distance in case of convex and concave mirrors?
Asked by Umesh
25th October 2017,
4:47 PM
Answered by Expert
Answer:
For Concave Mirror
- The object is always kept in front of the concave mirror and its distance from the mirror is taken as negative.
- The center of curvature and focus lie in front of the concave mirror, therefore radius of curvature and focal length are also taken as negative.
- Image height is taken as positive in the case of erect image and taken as negative in the case of an inverted image.
- The real image is formed in front of the mirror, therefore, the image distance is taken as negative and for virtual image, it is taken as positive which is formed behind the mirror.
For Convex Mirror
- The object is always kept in front of the convex mirror and its distance from the mirror is taken as negative.
- The center of curvature and focus lie in behind of the convex mirror, therefore radius of curvature and focal length are also taken as positive.
- In a convex mirror, an image formed is always erect, thus the image height is taken as positive.
- In a convex mirror, the image formed is always behind the mirror, therefore the image distance is taken as positive.
Answered by Expert
5th December 2017,
7:09 PM
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