Optical Instruments
30 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the minimum distance required between two pillars for a person to distinguish between them, located 11 km away?

  • 6.4 m
  • 1.6 m
  • 12.8 m
  • 3.2 m (correct)

    • Which of the following is a characteristic of Hypermetropia?

  • Distant objects are not seen clearly but nearer objects are clearly visible (correct)
  • Neither distant nor near objects are seen clearly
  • Distant objects are seen clearly but nearer objects are not clearly visible
  • Both distant and near objects are seen clearly

    • What is the reason for Hypermetropia?

  • Focal length or radii of curvature of lens increases or power of lens decreases (correct)
  • Distance between eye lens and retina decreases
  • Focal length or radii of curvature of lens decreases or power of lens increases
  • Distance between eye lens and retina increases

    • How can Hypermetropia be corrected?

    <p>By using a concave lens of suitable focal length</p> Signup and view all the answers

    What is the angle of resolution of the human eye?

    <p>1 minute of arc</p> Signup and view all the answers

    What is the minimum distance at which a normal eye can see objects clearly?

    <p>25 cm</p> Signup and view all the answers

    What is the minimum time interval between two consecutive light pulses that can be distinguished by the eye?

    <p>0.1 sec</p> Signup and view all the answers

    What is the minimum angular displacement between two objects that can be resolved by the eye?

    <p>1'</p> Signup and view all the answers

    What is the term for the ability to see objects using both eyes?

    <p>Binocular vision</p> Signup and view all the answers

    What is the part of the eye where the optic nerve goes to the brain and is not sensitive to light?

    <p>Blind spot</p> Signup and view all the answers

    What is the focal length of the lens used to correct myopia for a person who wants to see an object at distance D?

    <p>f = xy/(x-y)</p> Signup and view all the answers

    What is the main cause of presbyopia?

    <p>Loss of power of accommodation</p> Signup and view all the answers

    What type of lens is used to correct astigmatism?

    <p>Cylindrical lens</p> Signup and view all the answers

    What is the magnifying power of a microscope given by?

    <p>m = β/α</p> Signup and view all the answers

    What is the formula for magnification when the final image is formed at D and ∞ for a simple microscope?

    <p>mD = 1 + D/f</p> Signup and view all the answers

    What is the refractive index of the eye lens?

    <p>1.437</p> Signup and view all the answers

    What happens to the radius of curvature of the eye lens when ciliary muscles contract?

    <p>It decreases</p> Signup and view all the answers

    What is the purpose of the yellow spot in the retina?

    <p>To increase image brightness</p> Signup and view all the answers

    What is the significance of the power of accommodation in the human eye?

    <p>It enables the eye to focus on objects at different distances</p> Signup and view all the answers

    What is the minimum distance at which a normal eye can see objects clearly?

    <p>25 cm</p> Signup and view all the answers

    What is the minimum angular displacement required for the human eye to distinguish between two objects?

    <p>1/60 of a degree</p> Signup and view all the answers

    What is the effect of increasing the focal length of a corrective lens for hypermetropia?

    <p>It reduces the power of the lens</p> Signup and view all the answers

    What happens to the image formed in the eye in a person with hypermetropia?

    <p>The image is formed behind the retina</p> Signup and view all the answers

    What is the reason for the limitation of the resolving power of the human eye?

    <p>Limited density of photoreceptors in the retina</p> Signup and view all the answers

    What is the purpose of using a concave lens to correct hypermetropia?

    <p>To reduce the power of the lens</p> Signup and view all the answers

    What is the magnification of a simple microscope if the final image is formed at the minimum focal length?

    <p>1 + (D/f)</p> Signup and view all the answers

    What is the focal length of a lens used to correct myopia for a person who wants to see an object at distance D?

    <p>-Dd/(D-d)</p> Signup and view all the answers

    What is the condition for a telescope to have maximum magnifying power?

    <p>The eyepiece has a small focal length.</p> Signup and view all the answers

    What is the effect of increasing the aperture of a telescope on its resolving power?

    <p>It increases the resolving power.</p> Signup and view all the answers

    Which type of lens is used to correct astigmatism?

    <p>Cylindrical lens</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser