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प्रश्न
Define the term Principle focus.
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उत्तर
Principal focus of a spherical mirror is a point on the principal axis of the mirror, where all the rays travelling parallel to the principal axis and close to it after reflection from the mirror, converge to or appear to diverge from.
संबंधित प्रश्न
One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer. A 4 cm tall object is placed perpendicular to its principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image.
A ray of light is incident normally on a plane mirror. What will be the:
- angle of incidence?
- angle of reflection?
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
At which point of the spherical mirror the carbon paper is placed?
Name the spherical mirror which can produce a virtual and diminished image of an object.
What is a spherical mirror?
Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.
State the position of object for which the image formed by a concave mirror is of same size.
Define linear magnification produced by a mirror?
Define the term Pole.
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°
