Advertisements
Advertisements
प्रश्न
A point object is placed at O in front of a glass sphere as shown in figure.
Show the formation of the image by the sphere.
Advertisements
उत्तर
APPEARS IN
संबंधित प्रश्न
Calculate the focal length of a corrective lens having power +2D.
How unit of power related to focal length of a lens?
An object of height 4 cm is placed at a distance of 15 cm in front of a concave lens of power, −10 dioptres. Find the size of the image.
A symmetric double convex lens in cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4 D, the power a cut-lens will be
Surabhi from std. X uses spectacle. The power of the lenses in her spectacle is 0.5 D.
Answer the following questions from the given information:
- Identify the type of lenses used in her spectacle.
- Identify the defect of vision Surabhi is suffering from.
- Find the focal length of the lenses used in her spectacle.
How is accommodation produced?
Complete the diagram to show the formation of the image of the object AB.
(i) Name the Lens LL’.
(ii) Where is the image of the object AB formed?
(iii) State three characteristics of the image.
Increase in the converging power of eye lens cause ‘hypermetropia'
The same size images are formed by a convex lens when the object is placed at 20 cm or at 10 cm from the lens. The focal length of convex lens is ______ cm.
In what unit is the power of a lens expressed?
