Home
Class 10
PHYSICS
You can not enjoy watching a movie or te...

You can not enjoy watching a movie or television from a very short distance from the screen.

Text Solution

Verified by Experts

(i) If a person is very close to the screen, then the intensity of light falling on the eye is more .
(ii) The ability of a normal eye or pupil to adjust the opening for light is called adaptation.
(iii) As the light is bright, the pupil contracts and exposure in this condition for longer period of time can give an additional strain on the eye.
(iv) Due to this, person can not enjoy watching movie or television program sitting close to the screen.
Promotional Banner

Topper's Solved these Questions

  • LENSES

    CHETAN PUBLICATION|Exercise Answer the following questions:|16 Videos

  • LENSES

    CHETAN PUBLICATION|Exercise Draw well labelled diagrams for the following.|11 Videos

  • LENSES

    CHETAN PUBLICATION|Exercise Distinguish between:|3 Videos

  • HEAT

    CHETAN PUBLICATION|Exercise ASSIGNMENT - 5 (Answer the following: (Any 1))|3 Videos

  • MODEL ACTIVITY SHEET

    CHETAN PUBLICATION|Exercise SOLVE THE FOLLOWING QUESTIONS : (ANY 1)|9 Videos

Similar Questions

Explore conceptually related problems

Television waves range from

Find the locus of a polnt which moves such that its distance from the x-axis is equal to the distance from the y-axis.

For a parallel beam of monochromatic light of wavelength lambda diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of the light. If 'D' is the distance of the screen from the slit, the width of the central maxima will be:

A screen is placed a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens

A double slit S_1-S_2 is illuminated by a coherent light of wavelength lamda . The slits are separated by a distance d. A plane mirror is placed in front of the double slit at a distance D_1 , from it and a screen sum is placed behind the double slit at a distance D_2 , from it . The screen sum receives only the light reflected by the mirror. Find the fringe-width of the interference pattern on the screen.

You are observing top of your school building at an angle of elevation a from a point which is at d meter distance from foot of the building Which trigonometric ratio would you like to consider to find the height of the building?

A beam of light consisting of two wavelengths, 6500 Å and 5200 Å is used to obtain interference fringes in a Young's double slit experiment (1 Å = 10^(-10) m). The distance between the slits is 2.0 mm and the distance between the plane of the slits and the screen in 120 cm. (a) Find the distance of the third bright fringes on the screen from the central maximum for the wavelength 6500 Å (b) What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide ?

Find the locus of a point which moves such thet its distance from the x axis is twice the distance from y axis.

Find the locus of a point whose distance from (a, 0) is equal to its distance from the y-axis.