Optical Instruments: NEET Physics Previous Year Questions

36 previous year questions from Optical Instruments. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $The magnifying power of a telescope with tube length 60 cm is 5 . Then the focal length of its eye piece is$
2. $A compound microscope is a magnification of 24. The focal length of the eyepiece is 5 cm . The final image is formed at the least distance of distinct visi\dots$
3. $The magnifying power of a telescope with tube length 60 cm is 5. What is the focal length of its eye piece?$
4. $In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm. The focal length of the objective, when the angular magnification…$
5. $A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively To view an object 200 cm away from the objective, the lenses must be sepa\dots$
6. $The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 is of the order of$
7. $A small telescope has an objective of focal length 140 cm and an eyepiece of focal length 5.0 cm. The magnifying power of telescope for viewing a distant object is [NEET\dots$
8. $The aperture of the objective is 24.4 cm. The resolving power of this telescope. If a light of wavelength 2440 A is used to see the object will be$
9. $A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope, since [NEET 2021]$
10. $An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of$
11. $In a reflecting telescope, a secondary mirror is used to:$
12. $A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microsc…$
13. $A microscope is having objective of focal length 1 cm and eyepiece of focal length 6 cm . If tube length is 30 cm and image\dots$
14. $If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of focal length 5 mm, the focal length of\dots$
15. $The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are :$
16. $A telescope has magnifying power 5 and length of tube is 60 cm then the focal length of eye piece is$
17. $The diameter of moon is 3.5 \times 1 0^{3} k m and its distance from the earth is 3.8 \times 1 0^{5} k m . If it is seen through a telescope whose focal length for objective and eye lens\dots$
18. $Diameter of human eye lens is 2 mm. Whatwill be the minimum distance between two points to resolve them, which are situated at a distance of 50 meter from eye. The wavele\dots$
19. $The ratio of resolving powers of an optical microscope for two wavelengths λ_{1} = 4000 A^{\circ} and λ_{2} = 6000 A^{\circ} is$
20. $The aperture diameter of a telescope is 5m. The separation between the moon and the earth is 4 \times 1 0^{5} km. With light of wavelength of 5500 Å, the minimum separation b\dots$
21. $An astronomical telescope of tenfold angular magnification has a length of 44 cm. The focal length of the objective is$
22. $It the focal length of objective lens is increased then magnifying power of :$
23. $A telescope of aperture diameter 5 m is used to observe the moon from the earth. Distance between the moon and earth is 4 \times 10^{5} km . Determine the mini\dots$
24. $A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometre from two objects. The minimum distance between these two objects, which\dots$
25. $An astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be se\dots$

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Optical Instruments: NEET Physics Previous Year Questions

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