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16. Select the correct sequence of light entering the different parts of human eye: (NTSE Maharashtra, Stage-I, 2016-17)
Cornea, lens, iris, pupil, retina
Pupil, cornea, iris, lens, retina
Cornea, pupil, iris, lens, retina
Cornea, iris, pupil, lens, retina
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17. What will be the color of the sky as seen from the earth if there is no atmosphere? (NTSE West Bengal, Stage-I, 2015-16)
Black
Blue
Orange
Red
18. The far point of a myopic person is 75 cm in front of the eye. The nature and power of the lens required to correct the problem, will be (NTSE Rajasthan, Stage-I, 2014-15)
Convex lens, -1.33 D
Concave lens, -1.33 D
Concave lens, +1.33 D
Convex lens, +1.33 D
19. White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains (NTSE Haryana, Stage-I, 2013-14)
Yellow, orange, red
Violet, indigo, blue
All colours except green
All colours
20. Which of the following principle is followed to propagate light waves through an optical fiber? (NTSE West Bengal, Stage-I, 2013-14) (NTSE Telangana, Stage-I, 2016-17)
Diffraction
Interference
Total internal reflection
Scattering
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