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21. A concave mirror is placed in a horizontal table with its axis directed vertically upwards. Let 0 be pole of the mirror and C its centre of curvature. A point object is placed at C. It has a real image, also located at C. If the mirror is now filled with water, the image will be (NTSE Haryana, Stage-I, 2013-14)
Real and located at a point between C and 0
Real and will remain at C
Real and located at point between C and α
Virtual and located at a point between C and 0
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22. If a lens of focal length f, cut in two equal parts as shown below, are put in contact as shown in figure (i) and (ii) The resulting focal length of fig (i) and (ii) will be (NTSE Haryana, Stage-I, 2013-14)
f/2, 0
0, f/2
f, f
f/2, ∞
23. Power of a lens is measured in (NTSE Madhya Pradesh, Stage-I, 2014-15)
meter
centimeter
kilometer
diopter
24. As shown in figure, a liquid of refractive index n2 is poured onto the concave surface of concavo-convex lens. R1 and R2 are the radii of curvature of convex and concave surfaces of the lens respectively and R1 = 2R2· The refractive index of material of lens is n1. For which combination of n1 and n2, the whole system behaves as a diverging lens (NTSE Andhra Pradesh, Stage-I, 2014-15)
n1 = 1.2 and n2 = 1.8
n1 = 1.63 and n2 = 1.35
n1 = 1.56 and n2 = 1.33
n1 = 1.7 and n2 = 1.33
25. If a part of a convex lens is covered, its focal length will (NTSE West Bengal, Stage-I, 2014-15)
Remain unchanged
Become twice
Become half
Depend on the covered area
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