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प्रश्न
The radius of curvature of a convex mirror is 40 cm. Find its focal length.
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उत्तर
Focal length = ½ (Radius of curvature)
Or, f = `40/2` = 20 cm
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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?
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