Question

(a) 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.
(b) State whether convex lens has a real focus or a virtual focus.
(c) List some things that convex lens and concave mirror have in common.

Answer 1

Explanation:

(a) Suppose a parallel light-ray beam falls on a convex lens, and it can be seen in the diagram.

• These rays of light are parallel to each other and even to the lens axis.
• The ray's incident passes via the convex lens and are refracted by refraction rules. After traversing the convex lens, to the other side of the lens all the rays intersect, at the same position F.
• Point F is termed the convex lens principal focus. Thus the convergence point for the parallel beam of that light rays to an one single point is called the lens focus

 (b) A convex lens has a real focus because all the light rays will pass via the focus.

(c) The following are some things a convex lens and a concave lens have in common:

• A continuous beam of light rays converges both to a single point called the target.
• Both form images of an object, real and inverted, except in one case.

• For a concave lens, both form a true, upright, and magnified image if the object is positioned between the pole and focus of a convex mirror, and between the center of the lens and focus.

You can get all the answers of Chapter 5 in the link below:    

https://brainly.in/question/14963222

   

Few questions related to this chapter:

Draw a diagram to show how a converging lens held close to the eye acts as .....

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Answer 2

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