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Which statement is correct about telescope: a) The focal length of the objective lens is more than the eyepiece. b) The focal length of the eyepiece is more than the objective lens. c) The aperture of the objective lens is more than the eyepiece. d) The aperture of the eyepiece is more than the objective lens.

Which statement is correct about telescope: a) The focal length of the objective lens is more than the eyepiece. b) The focal length of the eyepiece is more than the objective lens. c) The aperture of the objective lens is more than the eyepiece. d) The aperture of the eyepiece is more than the objective lens. Correct Answer Statement a and c are correct

CONCEPT:

Telescope:

  • A telescope is an optical device that is used to see distant objects clearly.
  • It provides the angular magnification of distant objects.
  • The telescope consists of a long cylindrical tube carrying a convex lens of large focal length and large aperture at one end and a convex lens of small focal length and a small aperture to the other end.
  • The lens of the large focal length is kept towards the object and is called the objective lens.
  • The lens of a small focal length is kept towards the eye and is called the eyepiece.


EXPLANATION:

  • From the above, it is clear that the focal length of the objective lens is more than the eyepiece. Therefore statement a is correct.
  • The aperture of the objective lens is more than the eyepiece. Therefore statement c is correct.
  • Hence, option 1 is correct.

Related Questions

Consider the following statements   1. The focal length of the eyepiece is larger than the focal length of the objective. 2. The focal length of the eyepiece is smaller than the focal length of the objective. 3. The aperture of the eyepiece lens is larger than the objective lens. Which of the following statements is/are INCORRECT about a compound microscope?
In case of a compound microscope, which of the following statements is/are correct?
1. The focal length of the eyepiece is larger than the focal length of the objective.
2. The focal length of the eyepiece is smaller than the focal length of the objective.
3. The image produced in a normal optical microscope is real.
4. The image produced in a normal optical microscope is virtual.
Select the correct answer:
The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eyepiece is
In case of compound microscope which of the following statements is/are correct? 1) The focal length of eye piece is larger than the focal length of the objective 2) The focal length of the eye piece is smaller than the focal length of the objective 3) The image produced in a normal optical microscope is real 4) The image produced in a normal optical microscope is virtual
Which of the following statements about optical microscope is/are correct? 1. Both the eyepiece and objective of a microscope are convex lenses. 2. The magnification of a microscope increases with increase in focal length of the objective. 3.The magnification of a microscope depends upon the length of the microscope tube. 4. The eyepiece of a microscope is a concave lens. Select the correct answer using the code given below:
Which of the following statements about optical microscope is/are correct?
1. Both the eyepiece and objective of a microscope are convex lenses.
2. The magnification of a microscope increases with increases in focal length of the objective.
3. The magnification of a microscope depends upon the length of the microscope tube.
4. The eyepiece of a microscope is a concave lens.
Select the correct answer:
A microscope of objective focal length 1 cm and an eyepiece of focal length 2.0 cm has a tube length of 20 cm. What will be the magnification of the microscope?
The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for
Which of the following statements are always true? (i) When the object is placed nearer to the focal point of a converging lens the image gets bigger. (ii) When the object is placed farther away from the converging lens, the image gets smaller. (iii) When the object is placed very far away from the converging lens, the image distance approaches focal length.
In an observation with a telescope, having aperture of lens D, if the wavelength of the light is tripled then the resolving power of telescope will-