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प्रश्न
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उत्तर
The image of an object placed at a long distance in front of a convex mirror is formed at principal focus. The radius of the curvature of convex mirror is 20 cm.
The focal length of the convex mirror = radius of curvature/2.
Focal length of convex mirror = 20/2 = 10 cm.
So the image will form at a principal focus 10 cm away from the pole.
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संबंधित प्रश्न
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?
A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option)
(A) Convex lens of focal length 10 cm.
(B) Convex lens of radius of curvature 20 cm.
(C) Convex lens of focal length 20 cm.
(D) Concave mirror of focal length 20 cm.
An image formed by a ______ mirror is always of the same size as that of the object.
Name the two types of spherical mirrors. What type of mirror is represented by the:
back side of a shining steel spoon?
Name the spherical mirror which can produce a real and diminished image of an object.
A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
(i) Copy the figure below and draw rays to show how an image is formed by the lens.
Figure
(ii) Calculate the distance of the image from the lens by using the lens formula.
The magnification for a mirror is -3. How are u and v related?
