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प्रश्न
Briefly describe how you would find the focal length of a concave mirror quickly but approximately
उत्तर
For an object placed at the focus, the image formed by a concave mirror is at infinity. The image is highly magnified and real. So, we will move the object at a different point and check the image size and the point of formation. The point of focus of the concave mirror will be the point where the image formed is highly magnified and at infinity.
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संबंधित प्रश्न
Draw a ray diagram to show the path of the refracted ray in each of the following cases:-
A ray of light incident on a concave lens is
(i) passing through its optical centre.
(ii) parallel to its principal axis.
(iii) directed towards its principal focus.
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Name the mirror that can give an erect and enlarged image of an object.
Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror.
Copy this figure in your answer book and show the direction of the light ray after reflection:
Describe the nature of image formed when the object is placed at a distance of 20 cm from a concave mirror of focal length 10 cm
A man holds a spherical shaving mirror of radius of curvature 60 cm, and focal length 30 cm, at a distance of 15 cm, from his nose. Find the position of image, and calculate the magnification.
If the object is moved further away from the mirror, what changes are there in the position and size of the image?
In which equipment/s do you find ___________________
Define principal focus of the concave mirror.
