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16. The minimum distance between an object and its real image in a convex lens is (f = focal length of the lens) (NTSE West Bengal, Stage-I, 2013-14)
2.5f
2f
4f
f
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17. The correct relation between u, v and r for a mirror will be (symbols represent traditional meaning) (NTSE Rajasthan, Stage-I, 2013-14)
18. The distance between the objective lens and the eye-piece of an astronomical telescope will be (NTSE Rajasthan, Stage-I, 2013-14)
f0 + fe
f0 - fe
19. The particle of the medium in the transverse wave move in (NTSE Rajasthan, Stage-I, 2013-14)
Circular Motion (form)
Oval form
Direction of the wave motion
Perpendicular to the direction of the wave motion
20. The lens used in the camera is (NTSE Rajasthan, Stage-I, 2013-14)
Plano convex Lens
Plano concave Lens
Biconvex Lens
Biconcave Lens
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