Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
(i) Centre of curvature can be determined by constructing the imaginary sphere to which lens belongs.
(ii) Value of radius of curvature can be found by measuring the radius of this imaginary sphere geometrically.
(iii) The focal length is the midpoint of the pole and centre of curvature.
(iv) focal length of mirror = centre of curvature/2.
Centre of curvature = 2 .8 cm.
Focal length of mirror = 1.4 cm.
Focal length = radius of curvature/2.
APPEARS IN
संबंधित प्रश्न
A concave mirror always forms a real image.
A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel.
Explain the following term:
Incident ray
Draw diagram/diagrams to show them.
Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.
The magnification for a mirror is -3. How are u and v related?
The spherical mirror with a reflecting surface curved inward is called
