English
Tamil Nadu Board of Secondary EducationHSC Science Class 12

What is myopia?

Advertisements
Advertisements

Question

What is myopia?

Short/Brief Note
Advertisements

Solution

Myopia (or) short-sightedness is a vision defect in which a person can see nearby objects clearly but cannot see the distant objects clearly beyond a certain point.

shaalaa.com
  Is there an error in this question or solution?
Chapter 7: Wave Optics - Evaluation [Page 104]

APPEARS IN

Samacheer Kalvi Physics - Volume 1 and 2 [English] Class 12 TN Board
Chapter 7 Wave Optics
Evaluation | Q 45. | Page 104

RELATED QUESTIONS

Define and describe the magnifying power of an optical instrument.


Answer the following question in detail.

How does magnifying power differ from linear or lateral magnification?


Answer the following question in detail.

What is the limitation in increasing the magnifying powers of a compound microscope?


Discuss about simple microscope and obtain the equations for magnification for near point focusing and normal focusing.


What is the near point focusing?


What are the advantages and disadvantages of using a reflecting telescope?


What are the uses of spectrometer?


What is hypermetropia?


What is presbyopia?


Discuss about astronomical telescope.


Explain the preliminary adjustments of the spectrometer.


The near point and the far point for a person are 50 cm and 500 cm, respectively. Calculate the power of the lens the person should wear to read a book held in hand at 25 cm. What maximum distance is clearly visible for the person with this lens on the eye?


There are four convex lenses L1, L2, L3 and L4 of focal length 2, 4, 6 and 8 cm, respectively. Two of these lenses from a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are respectively


The magnifying power of a telescope is nine. When it is adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm. The focal length of objective and eyepiece are respectively.


The magnifying power of a telescope is high if its objective and eyepiece have respectively ______.


A simple microscope is used to see the object first in blue light and then in red light. Due to the change from blue to red light, what is the effect on its magnifying power?


The speed of light in media 'A' and 'B' are 2.0 × 1010 cm/s and 1.5 × 1010 cm/s respectively. A ray of light enters from medium B to A at an incident angle 'θ'. If the ray suffers total internal reflection, then ______.


An object viewed from a near point distance of 25 cm, using a microscopic lens with magnification '6', gives an unresolved image. A resolved image is observed at infinite distance with a total magnification double the earlier using an eyepiece along with the given lens and a tube of length 0.6 m, if the focal length of the eyepiece is equal to ______ cm.


An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20. To the observer the tree appears:


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×