31.If point object is placed at the focus of a concave mirror and m is lateral magnification obtained in the size of image, then 1) m=0 2)m>1 3)m<<1 4)m tends to minus infinity

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If a magnification of, -1 (minus one) is to be obtained by using a converging mirror, then the object has to be placed:
(a) between pole and focus (b) at the centre of curvature
(c) beyind the centre of curvature (d) at infinity

Q. An object is placed on the principal axis of a concave mirror at a distance of

60 c m

. If the focal length of the concave mirror is

40 c m

then determine the magnification of the obtained image.

Q. In order to obtain a magnification of, −0.6 (minus 0.6) with a concave mirror, the object must be placed:

(a) at the focus
(b) between pole and focus
(c) between focus and centre of curvature
(d) beyond the centre of curvature

Q. If a magnification of, –1 (minus 1) is obtained by using a converging lens, then the object has to be placed:
(a) within f
(b) at 2f
(c) beyond 2f
(d) at infinity

Q. An object is placed in front of the concave mirror at its focus. When an object moves from focus towards infinity the real image…….

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