Question

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in his/her notebook.)
Attempt all questions. Use separate sheets to solve t
Theme: Materials, Unit I: Chemical Substances - Nature and Beh
Theme: The World of the Living, Unit II: World of Living;
Theme: Natural Phenomena, Unit III: Natural Phenomena:
1. Define the principal focus of a concave mirror.
2. The radius of curvature of a spherical mirror is 20 cm.
What is i
3. Name a mirror that can give an erect and enlarged image of an
4. The magnification produced by a plane mirror is +1. What does
5. An object is placed at a distance of 10 cm from a convex mirro
the position and nature of the image.​

Answer 1

1 A number of rays parallel to the principal axis after reflection from a concave mirror meet at a point on the principal axis or appear to come from a point after reflection from a convex mirror on the principal axis. This is called principal focus.

2. if the radius of curvature is 20 cm then the focal length of mirror would be 10 cm

3. concave mirror can give give an erect and enlarged image of an object

4 if the magnification produced by a plane mirror is +1. that means the image is virtual and erect and of same size as of the object

5. you should give more information about his question

hope it helps you