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प्रश्न
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उत्तर
(i) The distance from the pole in the direction of incident ray is taken positive.
(ii) The distance from the pole in the direction opposite to the incident ray is taken negative.
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संबंधित प्रश्न
One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer. A 4 cm tall object is placed perpendicular to its principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image.
Explain the following term related to spherical lenses:- aperture
Which type of mirror can form a real image?
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Write true or false
A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.
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?
How is the focal length of a spherical mirror related to its radius of curvature?
