why humans are not able to see thee cathode rays in cathode ray tv as compared to an camera
Asked by souravkoshti | 16th Nov, 2014, 05:08: PM
Cathode rays are stream of electrons emitted from the cathode of a discharge tube,to which a potential difference of 10,000 V is applied and at a pressure of about 0.01 mm of Hg. Under such a condition the positive ions attain large kinetic energy and they eject electrons from the cathode. These electrons constitute cathode rays. These happen within the interior parts where all the necessary condition for the production of cathode rays are satisfied.A cathode ray tube actually converts the electrical signal into a visual signal by applying the electrical signal on the deflecting plate.Hence in a telvision we obtain the visual pattern of the electrical signal.
Answered by Jyothi Nair | 17th Nov, 2014, 09:29: AM
- what's myopia
- why normal can see only 25cm
- Where is the structure for bifocal lens
- Gently handle the spectacles of your grandparents and check the type of curvature in the lenses and record the observations about the vision through these lenses
- A person is unable to see distinctly the objects placed beyond 6m.Name the defect of vision he is suffering from?
- When a person is suffering from both myopia and hypermetropia, then what type of correction lenses are required?
- What is Presbyopia? How can it be corrected?
- State two main causes of person developing near sightedness. How can this defect be corrected?
- Give three differences between myopia and hypermetropia.
- The far point of a myopic person is 150 cm in front of the eye. Calculate the focal length and the power of lens required to enable him to see the distant objects clearly.
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Verify mobile number
Enter the OTP sent to your number