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प्रश्न
How is the focal length of a spherical mirror related to its radius of curvature?
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उत्तर
Focal length is half the radius of curvature of a spherical mirror.
f = `"R"/2`
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संबंधित प्रश्न
We can obtain an enlarged and erect image by a convex mirror.
A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
(i) Copy the figure below and draw rays to show how an image is formed by the lens.
Figure
(ii) Calculate the distance of the image from the lens by using the lens formula.
Explain the following terms :
Pole, Centre of curvature, Radius of curvature, Principal axis. Show them on separate diagrams for each of the concave and convex mirrors.
The focal length of a concave mirror is 10 cm. Find its radius of curvature.
Define the term principal focus in case of convex mirror. Draw a convex mirror and show its principal focus and focal length clearly.
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?
Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?
A spherical mirror whose reflecting surface is curved outwards is called ______ mirror.
