Reflection in spherical mirrors.
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This document discusses reflection of light and spherical mirrors. It explains that reflection occurs when light bounces off a smooth surface, enabling us to see the world. Spherical mirrors come in two types - concave and convex - depending on whether the reflecting surface curves inwards or outwards. Key terms are also defined, such as center of curvature, radius of curvature, and focal point. For concave mirrors, parallel rays of light passing through will converge at the principal focus after reflection. For convex mirrors, parallel rays appearing to diverge from a point on the other side define the principal focus.
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Reflection in spherical mirrors.
- 1. REFLECTION OF LIGHT IN SPHERICAL MIRRORS Presented by Sana
- 2. WHAT IS REFLECTION OF LIGHT? ❑ when a ray of light falls on a smooth surface and It bounces back ,this is reflection of light. ❑ Reflection of light enables us to see our beautiful world around us
- 3. LAWS OF REFLECTION incident ray, reflected ray and the normal at the point of incidence are in the same plane. The angle of incidence is always equal to angle of reflection.
- 4. WHY??
- 5. SMOOTH CURVED SURFACES Images are formed not only on plane mirrors but also on smooth curved surfaces.
- 6. SPHERICAL MIRRORS ❑Spherical mirrors are mirrors in which the reflecting surface is a part of the sphere. ❑There are two types of spherical mirrors . They are Concave mirrors and convex mirrors.
- 7. CONCAVE MIRROR It is a type of spherical mirror in which Reflecting surfaces are curved inwards. It is similar to inner surface of a spoon.
- 8. CONVEX MIRROR Convex mirrors are mirrors in which the reflecting surfaces are curved outwards Similar to outer surface of a steel spoon.
- 9. TERMS RELATED TO SPHERICAL MIRRORS Centre of curvature • Centre of a sphere of which the mirror is a part, is the Centre of curvature of the mirror. • Any line drawn from the centre of curvature to the mirror is normal to the mirror. Radius of curvature • Radius of curvature (R) of a mirror is the radius of the sphere of which it is a part. • Distance from the centre of curvature to the reflecting surface of a mirror is the radius of curvature.
- 10. APERTURE Aperture of a mirror is the reflecting surface of the mirror. POLE Pole of a mirror is the midpoint of the reflecting surface of the mirror. It is represented as P PRINCIPAL AXIS Principal axis of a mirror is the straight line connecting the pole of the mirror and the centre of curvature of the mirror.
- 11. FOR A CONCAVE MIRROR ❖Centre of curvature – C ❖Radius of curvature ( R)- AC,CP,CB ❖Pole – P ❖Principal axis – a line through C and P
- 12. REFLECTION FROM A SPHERICAL MIRROR ❑ Incident ray, reflected ray and the normal at the point of incidence are in the same plane. ❑ Angle of incidence and angle of reflection are equal in spherical mirrors.
- 14. FOCUS OF CONCAVE MIRROR ❑ Rays of light incident on a concave mirror, parallel to the principal axis, passes through a fixed point on the principal axis after reflection. This point is the principal focus (F) of the concave mirror.
- 15. PRINCIPAL FOCUS OF CONVEX MIRROR ❑ Rays of light incident on a convex mirror parallel to the principal axis appear to come from a fixed point on the other side of the mirror.This point is the principal focus of the convex mirror.
- 16. THANK YOU