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प्रश्न
A concave mirror can be used to produce a parallel beam of light. Draw a ray to illustrate this.
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उत्तर
In the case of a concave mirror if the object is placed at a Focal point then ray emerging from it after reflecting from the mirror would be parallel to the principal axis.
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संबंधित प्रश्न
A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option)
(A) Convex lens of focal length 10 cm.
(B) Convex lens of radius of curvature 20 cm.
(C) Convex lens of focal length 20 cm.
(D) Concave mirror of focal length 20 cm.
Define the following term in the context of spherical mirrors:- Centre of curvature
A concave mirror always forms a real image.
Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.
Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case.
At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.
A shopkeeper wanted to fix a mirror which will give a maximum view of his shop. What type of mirror should he use? Give reason.
