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प्रश्न
The focal length of a convex mirror is equal to its radius of curvature.
पर्याय
True
False
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उत्तर
False.
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संबंधित प्रश्न
Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Find the focal length of a convex mirror whose radius of curvature is 32 cm.
Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.
In a convex spherical mirror, reflection of light takes place at:
(a) a flat surface
(b) a bent-in surface
(c) a bulging-our surface
(d) an uneven surface
Name the mirror which can give:
an erect and diminished image of an object.
If a driver has one convex and one plane rear-view mirror, how would the images in each mirror appear different?
An object placed 20 cm in front of a mirror is found to have an image 15 cm (a) in front of it, (b) behind the mirror. Find the focal length of the mirror and the kind of mirror in each case.
Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed:
between F1 and the optical centre O of the lens.
Which of the above two cases shows the use of convex lens as a magnifying glass? Give reasons for your choice.
An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how the image is formed, and say whether the image is real or virtual.
Assertion: A real image cannot be produced by plane or convex mirror.
Reason: The focal length of a convex mirror is always taken as positive.
