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प्रश्न
The magnification for a mirror is -3. How are u and v related?
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उत्तर
Magnification of a mirror is
m = `-"v"/"u"`
∵ m = -3
∴ - 3 = `-"v"/"u"`
∴ v = 3u
But , u will always be negative
∴ v = -3u
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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?
Name the mirrors shown in Figure (a) and (b).
Does the mirror mentioned in part (b) form real image for all locations of the object?
The image formed by a convex mirror is of size one third the size of object. How are u and v related?
An object 5 cm high is placed at a distance 60 cm in front of a concave mirror of focal length 10 cm. Find the position and size of the image.
An object 5 cm high forms a virtual image of 1.25 cm high, when placed in front of a convex mirror at a distance of 24 cm. Calculate:
- the position of the image
- the focal length of the convex mirror.
Define the term Aperture.
What is the relationship between the focal length and radius of curvature?
