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प्रश्न
The distance from the pole to the focus is called ______.
विकल्प
pole length
focal length
principal axis
None of the above
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उत्तर
The distance from the pole to the focus is called focal length.
Explanation:
The distance from the pole (the center of a spherical mirror or lens) to the focus (the point where light rays converge or appear to diverge) is called the focal length.
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संबंधित प्रश्न
What type of image is formed:
- in a plane mirror?
- on a cinema screen?
A diverging lens is used in ______.
Which are the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain with the help of suitable ray diagrams.
In each case (a) and (b), draw reflected rays for the given incident rays and mark focus by the symbol F.
Discuss the position and nature of image formed by a convex mirror when an object is moved from infinity towards the pole of mirror.
Why does a driver use a convex mirror instead of a plane mirror as a rear view mirror?
Illustrate your answer with the help of a ray diagram.
The image formed by a convex mirror is of size one third the size of object. How are u and v related?
The following figure shows a concave mirror with its pole (P), focus (F), and center of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave mirror.
