3. Which line is taken as a base to draw a reflected ray to the given
incident ray?
4. Mention the points which lie on principal axis.
5. What do you mean by Focus?
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3. Plane mirror or any smooth surface.
4. Center of Curvature, focus, pole, radius of Curvature.
5. A central point, as of attraction, attention, or activity: The need to prevent a nuclear war became thefocus of all diplomatic efforts. Physics. a point at which rays of light, heat, or other radiation meet after being refracted or reflected.
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