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प्रश्न
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
A concave mirror always forms a real image.
A 2.0 cm tall object is placed 40 cm from a diverging lens of focal length 15 cm. Find the position and size of the image.
How is the focal length of a spherical mirror related to its radius
State the kind of mirror used
(a) by a dentist, and
(b) as a street light reflector.
Discuss the position and nature of image formed by a convex mirror when an object is moved from infinity towards the pole of mirror.
Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed :
(i) between the optical centre and principal focus of a convex lens.
(ii) anywhere in front of a concave lens.
(iii) at 2F of a convex lens.
State the signs and values of magnifications in the above-mentioned cases (i) and (ii).
Define the term Principle focus.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
