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प्रश्न
Define the following term in relation to concave mirror.
Principal focus
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उत्तर
It is a point on the principal axis, where a beam of light, parallel to the principal axis, after reflection actually meet.
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संबंधित प्रश्न
What is a spherical mirror?
State the kind of mirror used
(a) by a dentist, and
(b) as a street light reflector.
What is a spherical mirror?
Define the following term in relation to concave mirror.
Pole
An object 10 cm high is placed at a distance of 20 cm in front of a spherical mirror of focal length 25 cm. By scale drawing find the nature, position, and magnification of the image in the following case:
Convex mirror
The following Figure shows a concave mirror MM' on which a ray of light incident from a point P gets reflected to meet the principle axis at O.
(a) Find, by construction, the position of the centre of curvature of the concave mirror.
(b) Write down the value for the radius of curvature of the mirror.
(c) Calculate the focal length of the mirror.
(d ) Which relation is used in deducing the focal length from the radius of curvature?
A ray of light is incident towards a plane mirror at an angle of 30° with the mirror surface. What will be the angle of reflection?
