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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
If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram to support your answer.
Which type of mirror has:
- positive focal length?
- negative focal length?
State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).
What kind of mirrors are used in big shopping centres to watch the activities of the customers?
- Draw a labelled ray diagram to show the formation of image in a convex mirror when the object is at infinity. Mark clearly the pole and focus of the mirror in the diagram.
- State three characteristics of the image formed in this case.
- Draw diagram to show how a convex mirror can be used to give a large field of view.
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.
An object is placed at a distance of 100 cm from each of the above lenses A and B. Calculate
- image distance, and
- magnification, in each of the two cases.
The diagram given below in fig shows a ray of light AO falling on a surface separating two media. Draw the refracted ray in each, case.
Why a convex mirror is preferred for rearview mirrors in cars?
Higher-Order Thinking Skills:
A convex mirror is in water. What should be the change in its focal length?
