#### Optics One Mark

10th Standard

Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
10 x 1 = 10
1. The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in

(a)

A

(b)

B

(c)

C

(d)

D

2. In a myopic eye, the image of the object is formed

(a)

behind the retina

(b)

on the retina

(c)

in front of the retina

(d)

on the blind spot

3. The eye defect ‘presbyopia’ can be corrected by

(a)

convex lens

(b)

concave lens

(c)

convex mirror

(d)

Bi focal lenses

4. If VB, VG, VR be the velocity of blue, green and red light respectively in a glass prism, then which of the following statement gives the correct relation?

(a)

VB = VG = VR

(b)

VB > VG >VR

(c)

VB < VG < VR

(d)

VB < VG > VR

5. The path of light is ______

(a)

rays

(b)

point

(c)

lines

(d)

beam

6. The group of rays is ______

(a)

lines

(b)

dots

(c)

beam

(d)

none ofthese

7. The velocity of light is _______

(a)

3x 10-8 ms-1

(b)

3 x 108  ms-1

(c)

3 x 108 km s-1

(d)

3 x 10-8 km s-1

8. Velocity and wavelength of light are related by a relation

(a)

g-c⋋

(b)

$\gamma =\frac { c }{ \lambda }$

(c)

c=$\gamma$

(d)

both b & c

9. If the energy of the incident and scattered beam of light are same, then it is called ______ scattering

(a)

Ray light

(b)

Inelastic

(c)

Mie

(d)

Elastic

10. The scattering of light by colloidal particles is _____  scattering.

(a)

Ray light

(b)

Mie

(c)

Raman

(d)

Tyndall

11. 10 x 1 = 10
12. The refractive index of a transparent medium is always greater than__________

()

one

13. If the energy of incident beam and the scattered beam are same, then the scattering of light is called as________scattering.

()

elastic

14. Amount of light entering into the eye is controlled by________

()

Iris

15. Blue and green light has different _____ and ______

()

wavelength, frequency

16. Refraction is due to difference in _____ of light in different media.

()

velocity

17. Angle of refraction is _____ for red and _____ for violet.

()

smallest, highest

18. 1D is equal to _______

()

1 m-1

19. ______ tough membrane protects the internal parts of the eye.

()

sclera

20. Ciliary muscles help to change _____ of the eye lens according to the position of the object.

()

focal length

21. The focal length of the eye lens is adjusted by ______

()

ciliary muscles

22. 10 x 1 = 10
23. Ciliary muscles

24. (1)

Refraction

25. Hypermetropia

26. (2)

Luminous

27. Object which give out light

28. (3)

Scattering of light

29. Object which emit their own light

30. (4)

Reflection

31. violet light

32. (5)

source

33. red light

34. (6)

Dispersion

35. Deviation of ray

36. (7)

Power accommodation

37. Objects can be seen

38. (8)

near point moves away

39. Splitting up of colours

40. (9)

highest wavelength

41. Blue colour of the sea

42. (10)

highest frequency