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प्रश्न
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
पर्याय
plane
convex
concave
convex and concave
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उत्तर
concave
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संबंधित प्रश्न
A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?
Give one use each of a concave and a convex mirror.
Define Radius of curvature of the spherical mirror
How is a spherical mirror used to diverge a beam of light from a point? Name the type of mirror used.
State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
AB and CD, two spherical mirrors, from parts of a hollow spherical ball with its centre at O as shown in the diagram. If arc AB = `1/2` arc CD, what is the ratio of their focal lengths? State which of the two mirrors will always form virtual image of an object placed in front of it and why.
Three mirrors are created from a single sphere. Which of the following - pole, centre of curvature, radius of curvature, principal axis - will be common to them and which will not be common?
Draw suitable diagrams to illustrate the action of (i) concave mirror and (ii) convex mirror on a beam of light incident parallel to the principal axis.
State the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain your answer with the help of suitable ray diagrams.
The image formed by a convex mirror is of size one third the size of object. How are u and v related?
At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.
The sun is seen before the sunrise and after the sunset.
Define the following term:
spherical mirror
Define the following term in relation to concave mirror.
Aperture
Define the term Centre of curvature.
A student traces the path of a ray of light passing through a rectangular slab.
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For measuring the angle of incidence, he must position the protractor in the manner shown in the figure:
Explain why a ray of light passing through the center of curvature of a concave mirror, gets reflected along with the same pattern.
What is the focal length (f) of a mirror?
