Advertisements
Advertisements
Question
Name the lens for which magnification can be 1. For what position of the object will the magnification be 1?
Advertisements
Solution
The lens for which magnification can be 1 is a convex lens. For this, the object must be at 2F (i.e.r at distance twice the focal length, in front of the lens).
RELATED QUESTIONS
The speed of light in air is 3 × 108 m s-1. Calculate the speed of light in glass. The refractive index of glass is 1.5
Ray diagram for the formation of image by a magnifying glass.

An object is placed at a distance of 20 cm in front of a concave lens of focal length 20 cm. find: the magnification of image.
Name the lens used as a magnifying glass.
Why is the focal length of the lens, used as a magnifying glass, kept short?
Will the image formed by a magnifying glass be real or virtual?
Copy and complete the following ray diagram.

An object AB is placed between 2F1 and F1 on the principal axis of a convex lens as shown in the diagram. Copy the diagram and using three rays starting from point A, obtain the image of the object formed by the lens.

What is a magnifying glass (or a simple microscope)? Draw a ray diagram to show how a convex lens may be used as a magnifying glass. Where should the object be placed? State three characteristics of the image formed.
Write an expression for the magnifying power of a simple microscope. How can it be increased?
