10th Class Physical Science Chapter wise Important bit bank in English

26. A triangular glass prism has ______ triangular bases and _______ rectangular plane lateral surfaces.

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two , three

27. The angle between the incident ray and normal is called _________ (i1).

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angle of incidence

28. The ray which comes out of the outer surface of the prism is called ____________.

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emergent ray

29. The angle between the plane surfaces any two sides are called the _________ or refracting angle of prism (A).

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angle of the prism

30. The angle between the incident ray and emergent ray is called _____________ (d).

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angle of deviation

31. The refractive index of a prism by using the formula, n =

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\frac { Sin(\frac { A+D }{ 2 } ) }{ Sin(\frac { A }{ 2 } ) }

32. The splitting of white light into different colours (VIBGYOR) is called __________.

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dispersion

33. We can consider that white light is a collection of waves with different ____________.

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wavelengths

34. Light is an ______________ wave.

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electromagnetic

35. The refractive index of a medium depends on _____________ of light.

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wavelength

36. Red colour has ________ wavelength and ___________ colour has shortest wavelength.

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longest , violet

37. The relation between the speed of wave (u), wavelength (λ) and frequency (f) is, v= ________. (Frequency (f) may be denoted by ‘u’)

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f λ

38. Speed of the wave increases with increase in __________ of light.

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wavelength

39. The angle between the incoming and outgoing rays can be anything between ____ and about _______ .

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0, 42 degree

40. The beautiful colours of the rainbow are due to ___________ of the sunlight by millions of tiny water droplets.

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dispersion

41. The rays of sunlight enter the drop near its top surface. At this first refraction, the white light is dispersed into its spectrum of colours, _________ being deviated the most and red the least.

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violet

42. The atoms or molecules are called ________________.

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scattering center

43. The intensity of scattered light varies with angle of __________.

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scattering

44. The intensity is maximum at ______ angle of scattering.

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90 degree

45. The reason for blue sky is due to the molecules _______ and ______.

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N2, O2

46. _________ found experimentally that the frequency of scattered light by the liquids is greater than the frequency of incident light.

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C.V Raman

47. Raman introduced the ____________.

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Raman Effect

48. Raman effect is helpful to determine the shapes of the ___________.

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molecules

49. The defect in which people cannot see objects situated before near point is called ________________.

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Hypermetropia

50. ___________ is a vision defect indicating that the power of accommodation of the eye usually decreases with ageing.

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Presbyopia

51. The reciprocal of focal length is called ___________.

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power of the lens
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