Optical Instrument and Human eye
Ray Optics

282851 An astronomical refracting telescope is being used by an observer to observe planets in normal adjustment. The focal lengths of the objective and eye piece used in the construction of the telescope are \(20 \mathrm{~m}\) and \(2 \mathrm{~cm}\) respectively. Consider the following statements about the telescope:

1 (a), (b) and (c)
2 (b), (c) and (d)
3 (c), (d) and (a)
4 (a), (b) and (d)
Ray Optics

282852 The human eye has an approximate angular resolution of \(\theta=5.8 \times 10^{-4} \mathrm{rad}\) and typical photo printer prints a minimum of \(300 \mathrm{dpi}\) (dots per inch, 1 inch \(=2.54 \mathrm{~cm})\). At what minimal distance \(d\) should a printed page be held so that one does not see the individual dots?

1 \(20.32 \mathrm{~cm}\)
2 \(29.50 \mathrm{~cm}\)
3 \(14.59 \mathrm{~cm}\)
4 \(6.85 \mathrm{~cm}\)
Ray Optics

282853 The focal lengths of the objective and the eye piece of a telescope are \(50 \mathrm{~cm}\) and \(5 \mathrm{~cm}\) respectively. Least distance of distinct vision is \(25 \mathrm{~cm}\). The telescope is focused for distinct vision on a scale placed sat a distance of \(200 \mathrm{~cm}\) away from objective then the separation between the objective and the eye piece is

1 \(100 \mathrm{~cm}\)
2 \(75 \mathrm{~cm}\)
3 \(70.8 \mathrm{~cm}\)
4 \(60.8 \mathrm{~cm}\)
Ray Optics

282854 A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope, since

1 A large aperture contributes to the quality and visibility of the images
2 a large area of the objective ensures better light gathering power
3 a large aperture provides a better resolution
4 All of the above
Ray Optics

282855 For what distance the ray optics will be good approximation when the aperture is \(5 \mathrm{~mm}\) wide and the wavelength is \(450 \mathrm{~nm}\) ?

1 \(45.55 \mathrm{~m}\)
2 \(55.55 \mathrm{~m}\)
3 \(35.55 \mathrm{~m}\)
4 \(40.55 \mathrm{~m}\)
Ray Optics

282851 An astronomical refracting telescope is being used by an observer to observe planets in normal adjustment. The focal lengths of the objective and eye piece used in the construction of the telescope are \(20 \mathrm{~m}\) and \(2 \mathrm{~cm}\) respectively. Consider the following statements about the telescope:

1 (a), (b) and (c)
2 (b), (c) and (d)
3 (c), (d) and (a)
4 (a), (b) and (d)
Ray Optics

282852 The human eye has an approximate angular resolution of \(\theta=5.8 \times 10^{-4} \mathrm{rad}\) and typical photo printer prints a minimum of \(300 \mathrm{dpi}\) (dots per inch, 1 inch \(=2.54 \mathrm{~cm})\). At what minimal distance \(d\) should a printed page be held so that one does not see the individual dots?

1 \(20.32 \mathrm{~cm}\)
2 \(29.50 \mathrm{~cm}\)
3 \(14.59 \mathrm{~cm}\)
4 \(6.85 \mathrm{~cm}\)
Ray Optics

282853 The focal lengths of the objective and the eye piece of a telescope are \(50 \mathrm{~cm}\) and \(5 \mathrm{~cm}\) respectively. Least distance of distinct vision is \(25 \mathrm{~cm}\). The telescope is focused for distinct vision on a scale placed sat a distance of \(200 \mathrm{~cm}\) away from objective then the separation between the objective and the eye piece is

1 \(100 \mathrm{~cm}\)
2 \(75 \mathrm{~cm}\)
3 \(70.8 \mathrm{~cm}\)
4 \(60.8 \mathrm{~cm}\)
Ray Optics

282854 A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope, since

1 A large aperture contributes to the quality and visibility of the images
2 a large area of the objective ensures better light gathering power
3 a large aperture provides a better resolution
4 All of the above
Ray Optics

282855 For what distance the ray optics will be good approximation when the aperture is \(5 \mathrm{~mm}\) wide and the wavelength is \(450 \mathrm{~nm}\) ?

1 \(45.55 \mathrm{~m}\)
2 \(55.55 \mathrm{~m}\)
3 \(35.55 \mathrm{~m}\)
4 \(40.55 \mathrm{~m}\)
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Ray Optics

282851 An astronomical refracting telescope is being used by an observer to observe planets in normal adjustment. The focal lengths of the objective and eye piece used in the construction of the telescope are \(20 \mathrm{~m}\) and \(2 \mathrm{~cm}\) respectively. Consider the following statements about the telescope:

1 (a), (b) and (c)
2 (b), (c) and (d)
3 (c), (d) and (a)
4 (a), (b) and (d)
Ray Optics

282852 The human eye has an approximate angular resolution of \(\theta=5.8 \times 10^{-4} \mathrm{rad}\) and typical photo printer prints a minimum of \(300 \mathrm{dpi}\) (dots per inch, 1 inch \(=2.54 \mathrm{~cm})\). At what minimal distance \(d\) should a printed page be held so that one does not see the individual dots?

1 \(20.32 \mathrm{~cm}\)
2 \(29.50 \mathrm{~cm}\)
3 \(14.59 \mathrm{~cm}\)
4 \(6.85 \mathrm{~cm}\)
Ray Optics

282853 The focal lengths of the objective and the eye piece of a telescope are \(50 \mathrm{~cm}\) and \(5 \mathrm{~cm}\) respectively. Least distance of distinct vision is \(25 \mathrm{~cm}\). The telescope is focused for distinct vision on a scale placed sat a distance of \(200 \mathrm{~cm}\) away from objective then the separation between the objective and the eye piece is

1 \(100 \mathrm{~cm}\)
2 \(75 \mathrm{~cm}\)
3 \(70.8 \mathrm{~cm}\)
4 \(60.8 \mathrm{~cm}\)
Ray Optics

282854 A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope, since

1 A large aperture contributes to the quality and visibility of the images
2 a large area of the objective ensures better light gathering power
3 a large aperture provides a better resolution
4 All of the above
Ray Optics

282855 For what distance the ray optics will be good approximation when the aperture is \(5 \mathrm{~mm}\) wide and the wavelength is \(450 \mathrm{~nm}\) ?

1 \(45.55 \mathrm{~m}\)
2 \(55.55 \mathrm{~m}\)
3 \(35.55 \mathrm{~m}\)
4 \(40.55 \mathrm{~m}\)
Ray Optics

282851 An astronomical refracting telescope is being used by an observer to observe planets in normal adjustment. The focal lengths of the objective and eye piece used in the construction of the telescope are \(20 \mathrm{~m}\) and \(2 \mathrm{~cm}\) respectively. Consider the following statements about the telescope:

1 (a), (b) and (c)
2 (b), (c) and (d)
3 (c), (d) and (a)
4 (a), (b) and (d)
Ray Optics

282852 The human eye has an approximate angular resolution of \(\theta=5.8 \times 10^{-4} \mathrm{rad}\) and typical photo printer prints a minimum of \(300 \mathrm{dpi}\) (dots per inch, 1 inch \(=2.54 \mathrm{~cm})\). At what minimal distance \(d\) should a printed page be held so that one does not see the individual dots?

1 \(20.32 \mathrm{~cm}\)
2 \(29.50 \mathrm{~cm}\)
3 \(14.59 \mathrm{~cm}\)
4 \(6.85 \mathrm{~cm}\)
Ray Optics

282853 The focal lengths of the objective and the eye piece of a telescope are \(50 \mathrm{~cm}\) and \(5 \mathrm{~cm}\) respectively. Least distance of distinct vision is \(25 \mathrm{~cm}\). The telescope is focused for distinct vision on a scale placed sat a distance of \(200 \mathrm{~cm}\) away from objective then the separation between the objective and the eye piece is

1 \(100 \mathrm{~cm}\)
2 \(75 \mathrm{~cm}\)
3 \(70.8 \mathrm{~cm}\)
4 \(60.8 \mathrm{~cm}\)
Ray Optics

282854 A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope, since

1 A large aperture contributes to the quality and visibility of the images
2 a large area of the objective ensures better light gathering power
3 a large aperture provides a better resolution
4 All of the above
Ray Optics

282855 For what distance the ray optics will be good approximation when the aperture is \(5 \mathrm{~mm}\) wide and the wavelength is \(450 \mathrm{~nm}\) ?

1 \(45.55 \mathrm{~m}\)
2 \(55.55 \mathrm{~m}\)
3 \(35.55 \mathrm{~m}\)
4 \(40.55 \mathrm{~m}\)
Ray Optics

282851 An astronomical refracting telescope is being used by an observer to observe planets in normal adjustment. The focal lengths of the objective and eye piece used in the construction of the telescope are \(20 \mathrm{~m}\) and \(2 \mathrm{~cm}\) respectively. Consider the following statements about the telescope:

1 (a), (b) and (c)
2 (b), (c) and (d)
3 (c), (d) and (a)
4 (a), (b) and (d)
Ray Optics

282852 The human eye has an approximate angular resolution of \(\theta=5.8 \times 10^{-4} \mathrm{rad}\) and typical photo printer prints a minimum of \(300 \mathrm{dpi}\) (dots per inch, 1 inch \(=2.54 \mathrm{~cm})\). At what minimal distance \(d\) should a printed page be held so that one does not see the individual dots?

1 \(20.32 \mathrm{~cm}\)
2 \(29.50 \mathrm{~cm}\)
3 \(14.59 \mathrm{~cm}\)
4 \(6.85 \mathrm{~cm}\)
Ray Optics

282853 The focal lengths of the objective and the eye piece of a telescope are \(50 \mathrm{~cm}\) and \(5 \mathrm{~cm}\) respectively. Least distance of distinct vision is \(25 \mathrm{~cm}\). The telescope is focused for distinct vision on a scale placed sat a distance of \(200 \mathrm{~cm}\) away from objective then the separation between the objective and the eye piece is

1 \(100 \mathrm{~cm}\)
2 \(75 \mathrm{~cm}\)
3 \(70.8 \mathrm{~cm}\)
4 \(60.8 \mathrm{~cm}\)
Ray Optics

282854 A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope, since

1 A large aperture contributes to the quality and visibility of the images
2 a large area of the objective ensures better light gathering power
3 a large aperture provides a better resolution
4 All of the above
Ray Optics

282855 For what distance the ray optics will be good approximation when the aperture is \(5 \mathrm{~mm}\) wide and the wavelength is \(450 \mathrm{~nm}\) ?

1 \(45.55 \mathrm{~m}\)
2 \(55.55 \mathrm{~m}\)
3 \(35.55 \mathrm{~m}\)
4 \(40.55 \mathrm{~m}\)