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प्रश्न
The diagram below shows the parallel rays incident on a convex mirror. C is the centre of the curvature of the mirror. By drawing the paths of the reflected rays, label the focus F and hence find the focal length of the mirror.
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उत्तर
We know when the incident ray is parallel to the principal axis then they appear to diverge from a point F.
Geometrically we can find this value and this comes to 2 cm. Centre of curvature = 4 cm.
Focal length = centre of curvature/2.
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संबंधित प्रश्न
Image formed by a convex ______ is always virtual and smaller in size.
What is a virtual image?
- A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
- Copy the figure below and draw rays to show how an image is formed by the lens.
- Calculate the distance of the image from the lens by using the lens formula.
- Copy the figure below and draw rays to show how an image is formed by the lens.
- The diverging lens in part (a) is replaced by a converging lens also of focal length 100 mm. The object remains in the same position and an image is formed by the converging lens. Compare two properties of this image with those of the image formed by the diverging lens in part (a).
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.
Write two more characteristics of the image.
Define the term principal focus in case of convex mirror. Draw a convex mirror and show its principal focus and focal length clearly.
Name the two types of spherical mirrors.
