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Define the following term in the context of spherical mirrors:- Principal focus
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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?
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.
- Light Reflection and Refraction part 4 (Focal Length of Spherical Mirror)
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- Light Reflection and Refraction part 3 (Spherical Mirror)
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- Light Reflection and Refraction part 5 (Image formation Spherical Mirror)
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- Light Reflection and Refraction part 8 (Spherical Mirror Application)
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