Physics GK 19 - Light and Human Eye

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1).
Which of the following is the mirror formula?
2).
What do we call the phenomenon of light being deflected when travelling obliquely from one medium to another?
3).
Which of the following represents the Snell's law?
4).
What is the refractive index of water?
5).
What happens when light travels from a denser medium to a rarer medium?
6).
Where will be the image formed by a convex lens when the object is placed at the focus?
7).
Which of the following gives the power of a lens?
8).
Which of the following is true about a concave lens?
9).
What is the S.I. unit of power of a lens?
10).
Which of the following is true about the focal length of a spherical mirror?
11).
What do we call the ratio of the speed of light in vacuum to speed of light in a medium?
12).
What is the eye defect when a person can see nearby objects clearly but cannot see distant objects distinctly known as?
13).
Which of these phenomenon is due to the scattering of light?
14).
What causes the twinkling of stars?
15).
Which of the following eye-defects is also known as far -sightedness?
16).
What do we call the long-sightedness caused by loss of elasticity of the lens of the eye?
17).
Which of the following regions of electromagnetic spectrum is called as light?
18).
What is the distance between the focus and the pole of the mirror is known as?
19).
Which of the following is a law of reflection?
20).
What of the following represents linear magnification?
21).
What is the phenomenon of bouncing back of light in the same medium on striking the surface of any object known as?
22).
What is the size of the image formed by a concave mirror when the object is at focus?
23).
What is the splitting of light into its colours known as?
24).
What part of eyes give it a distinctive colour?
25).
Which of the following part of eyes controls the size of the pupil?
26).
For how long approximately an image persists on the retina before vanishing?
27).
In which of the following cases a concave mirror will form a virtual and erect image?
28).
Which of the following are the cases of use of concave mirrors?
29).
What is the nature of image formed by a convex mirror when the object is placed at infinity?
30).
Which of the following mirrors is commonly used as rear-view mirror in a vehicle?
1. Which of the following is the mirror formula?
[A] v + u =f
[B] 1/v + 1/u = 1/f
[C] 1/v + 1/u = f
[D] None of the above
2. What do we call the phenomenon of light being deflected when travelling obliquely from one medium to another?
[A] Refraction
[B] Reflection
[C] Dispersion
[D] Convergence
3. Which of the following represents the Snell’s law?
[A] sine of angle of incidence/sine of angle of refraction = constant
[B] cosine of angle of incidence/cosine of angle of refraction = constant
[C] tangent of angle of incidence/tangent of angle of refraction = constant
[D] angle of incidence – angle of refraction = constant
4. What is the refractive index of water?
[A] 1
[B] 1.01
[C] 1.33
[D] 1.78
5. What happens when light travels from a denser medium to a rarer medium?
[A] it slows down and bends towards the normal
[B] it speeds up and bends towards the normal
[C] it slows down and bends away from the normal
[D] it speeds up and bends away from the normal
6. Where will be the image formed by a convex lens when the object is placed at the focus?
[A] No image is formed
[B] At focus
[C] Between focus and optical centre
[D] At infinity
7. Which of the following gives the power of a lens?
[A] equal to its focal length
[B] reciprocal of its focal length
[C] half of its focal length
[D] double the focal length
8. Which of the following is true about a concave lens?
[A] power of a concave lens is positive
[B] power of a concave lens is negative
[C] power of a concave lens is zero
[D] None of the above
9. What is the S.I. unit of power of a lens?
[A] metre
[B] watt
[C] dioptre
[D] second
10. Which of the following is true about the focal length of a spherical mirror?
[A] it is equal to its radius of curvature
[B] it is equal to half its radius of curvature
[C] it is equal to twice its radius of curvature
[D] None of the above
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