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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
How is a spherical mirror used to converge a beam of light at a point? Name the type of mirror used.
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
Explain the meaning of the terms focus and focal length in case of a convex mirror, with the help of suitable ray diagram.
What type of mirror can be used to obtain a real image of an object?
State two uses of a concave mirror.
An object of length 4 cm is placed in front of a concave mirror at distance 30 cm. The focal length of mirror is 15 cm.
- Where will the image form?
- What will be the length of image?
Define the term Normal.
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?
