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प्रश्न
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
उत्तर
Focus of a concave mirror: The focus of a concave mirror is a point on the principal axis through which the light rays incident parallel to principal axis, pass after reflection from the mirror.
Focal length of a concave mirror: The distance of the focus from the pole of the concave mirror is called its focal length.
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संबंधित प्रश्न
Define the following term in the context of spherical mirrors:- Pole
What happens when a ray of light falls normally (or perpendiculary) on the surface of a plane mirror?
State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
The image formed by a convex mirror is of size one third the size of object. How are u and v related?
Define the following term:
spherical mirror
Define the term Centre of curvature.
Find the height of the image of a body of height 1.5m in a mirror with a magnification of 1.5.
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
Assertion: Incident ray is directed towards the centre of curvature of spherical mirror. After reflection it retraces its path.
Reason: Angle of incidence (i) = Angle of reflection (r) = 0°
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
