Advertisements
Advertisements
प्रश्न
How will you decide whether a given piece of glass is a concave lens, convex lens, or a plane glass plate?
उत्तर
Hold the given piece of glass over some printed number:
(i) If the letter appears magnified, the given piece is a convex lens.
(ii) If the letters appear diminished, the given piece is a concave lens.
(iii) If the letters appear to be of the same size, then it is a plane glass mirror.
APPEARS IN
संबंधित प्रश्न
An object is placed at a distance of 15 cm from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
You eye contains a convex lens. Why is it unwise to look at the sun?
With the help of a labelled diagram explain how a convex lens converges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the convex lens on the diagram.
In figure , name the ray which represents the correct path of light while emerging out through
a glass block.
A lens forms an upright and magnified image of an object. Name the lens.
A convex lens forms an inverted image of size same as that of the object which is placed at a distance 60 cm in front of the lens. Find: The position of image
State the nature and position of the object on the principal axis to obtain a virtual and magnified image.
An object is placed in front of a convex lens such that the image formed has the same size as that of the object. Draw a ray diagram to illustrate this.
Object at 2F1 of a convex lens : Image at 2F2 : : Object at F1 : _______
- In which type of microscope do you find the lens arrangement as shown in the following diagram?
- Write about the working and the use of this microscope.
