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प्रश्न
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?
पर्याय
MW
MS
SW
MW-WS
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उत्तर
MS
Explanation:
The focal length of a concave mirror is the distance between its pole and principal focus.
That is, the distance of the image formed (screen) from the concave mirror will be equal to the focal length of the concave mirror.
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संबंधित प्रश्न
Define the following term in the context of spherical mirrors:- Centre of curvature
Explain the following term related to spherical lenses:- aperture
An image which can be obtained on a screen is called a ______ image.
Define Radius of curvature of the spherical mirror
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.
Name the kind of mirror used to obtain
(a) a real and enlarged image
(b) a virtual and enlarged image
(c) a real and diminished image, and
(d) a virtual and diminished image.
Figure shows a concave mirror with its pole at P, focus F and centre of curvature C. Draw ray diagram to show the formation of image of an object OA.
How will you distinguish between a plane mirror, a concave mirror and a convex mirror, without touching them?
Numerical problem.
The radius of curvature of a spherical mirror is 25 cm. Find its focal length.
In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm. The focal length of the objective, when the angular magnification of the telescope is 2, will be ______.
