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61. The path of ray of light in different media of refractive indices n1, n2, n3 and n4 is shown in figure. The velocity of light will be maximum in the medium whose refractive index is (NTSE Rajasthan, Stage-I, 2016-17)
n1
n2
n3
n4
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62. An object is placed at a distance x1 from the focus on the principal axis of a concave mirror. The image is formed at a distance x2 from the focus. Then the focal length of the mirror is (NTSE Odisha, Stage-I, 2015-16)
X1X2
√(x1X2)
63. Two thin lenses of focal lengths f1 and f2 are placed in contact with each other such that the combination behaves as a glass slab. Then how are f1 and f1 related to each other? (NTSE Odisha, Stage-I, 2015-16)
f2 = -f1
f1 = f2
f1 = √f2
64. Identify the device used as spherical mirror or lens in the following cases when the image formed is virtual and erect in each case A: Object is placed between device and its focus, image is enlarged and behind it. B : Object placed between focus and device image formed is enlarged and on the same side as that of object. (NTSE Haryana, Stage-I, 2015-16) A B
Convex lens Concave mirror
Convex mirror Convex lens
Concave mirror Convex lens
Concave mirror Concave lens
65. If λr and λv are wavelengths of light rays of red and violet colours respectively then (NTSE Madhya Pradesh, Stage-I, 2015-16)
λr < λv
λr > λv
λr = λv
None of these
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