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(a) 1
(c) 7.5 cm
(b) girl
(b) Darwin
(d) ∞
(a) 0
(a) 6
(b) a convex lens of lesser focal length (<f)
(b) infinity
(c) - 33.3 cm
(c) – 33.3 cm
Air, water and glass are three consecutive media of parallel surfaces through which light is allowed to pass. The ratio of the angle of refraction in the first surface (air-water) to the incident angle at the second surface (water-glass) is
(a) 1
(a) 1
See lessAn object at a depth of 10 cm in water seems to be at a depth of (refractive index of water=4/3)
(c) 7.5 cm
(c) 7.5 cm
See lessA zygote which has an X-chromosome inherited from the father will develop into a
(b) girl
(b) girl
See lessThe theory of-evolution of species by natural selection was given by
(b) Darwin
(b) Darwin
See lessTwo plane mirrors are facing each other. An object placed between them has N number of images. The value of N is
(d) ∞
(d) ∞
See lessThe angle between the incident and the emergent ray in a glass slab is
(a) 0
(a) 0
See lessThree lenses A, B and C produce magnification of 1, 2 and 3 respectively. The net magnification of the combination is
(a) 6
(a) 6
See lessTo get real image using a concave lens (f) one has to use
(b) a convex lens of lesser focal length (<f)
(b) a convex lens of lesser focal length (<f)
See lessOne concave and one convex lens of equal focal length are placed in contact. The focal length of the combination is
(b) infinity
(b) infinity
See lessThe focal length of a lens of power – 3D is
(c) - 33.3 cm
(c) – 33.3 cm
See less