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प्रश्न
When an object of height 1 cm is kept at a distance 4 cm from a concave mirror, its erect image of height 1.5 cm is formed at a distance 6 cm behind the mirror. Find the focal length of mirror, by drawing.
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उत्तर
A ray passing parallel to the principal axis passes through the focal point after reflection. Hence, the focal length is 12 cm.
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संबंधित प्रश्न
Explain the following term related to spherical lenses: focal length
Name the spherical mirror which has:
(a) virtual principal focus.
(b) real principal focus.
Define the following terms in the context of spherical mirrors :
(i) Pole
(ii) Centre of curvature
(iii) Radius of curvature
(iv) Principal axis
State the number of images of an object placed between two mirrors, formed in each case when mirrors are inclined to each other at (a) 90°, and (b) 60°.
In each case (a) and (b), draw reflected rays for the given incident rays and mark focus by the symbol F.
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.
State whether the image in part (a) is real or virtual?
Does the mirror name by your form a real image for all locations? Give a reason for your answer.
An object is placed in front of a concave mirror as shown in the following figure. By scale drawing, find the nature of the image. Given f = 10 cm, v = 30 cm.
What is the focal length (f) of a mirror?
