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प्रश्न
Explain the meaning of the terms focus and focal length in case of a convex mirror, with the help of suitable ray diagram.
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उत्तर
Focus of a convex mirror: The focus of a convex mirror is a point on the principal axis from which, the light rays incident parallel to principal axis, appear to come, after reflection from the mirror.
Focal length of a convex mirror: The distance of the focus from the pole of the convex mirror is called its focal length.
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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.
What type of image is formed:
in a plane mirror?
A ray of light travels from a denser medium to a rarer medium. How will it bend?
If a spherical mirror breaks, what type of mirrors are the individual pieces?
What is meant by magnification? Write its expression. What is its sign for the (a) real (b) virtual, image?
An object is placed at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. Find the position of image. Is the image magnified?
Define the term Pole.
Draw a ray diagram to show that a convex mirror has a wider field of view.
What is “aperture”?
