(a) Draw a diagram to show how a converging lens focusses parallel rays of light?(b) How would you alter the above diagram to show how a converging lens can produce a beam of parallel rays of light.
(a) A converging lens focuses parallel rays of light at the focus $(F)$ of the lens as shown below in the figure:
A convex lens converges (brings closer) a parallel beam of light rays to a point $F$ (focus) on its other side (right side).
(b) To show how a converging lens can produce a beam of parallel rays of light, the above diagram can be altered by placing a source of light at the focus of the converging lens.
Image is posted for reference only
Related Articles
- A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:(a) a convergent beam of light (b) a pergent beam of light(c) a parallel beam of light (d) a patch of coloured light
- A small electric lamp is placed at the focus of a convex lens. State the nature of beam of light produced by the lens. Draw a diagram to show this.
- Name the defect of vision which can be corrected by a converging lens. Show clearly by a ray diagram how the lens corrects the defect.
- Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.
- Describe with a suitable diagram, how a convex mirror perges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of convex mirror in this diagram.
- A ray of light is going towards the focus of a concave lens. draw a ray diagram to show the path of this ray of light after refraction through the lens.
- Fill in the following blanks with suitable words:(a) A convex lens _________ rays of light, whereas a concave lens _________ rays of light.(b) Lenses refract light to form images: a _________ lens can form both real and virtual images, but a perging lens forms only _________ images.
- Why does the eye-lens not have to do all the work of converging incoming light rays?
- Which mirror is used as a torch reflector? Draw a labelled diagram to show how a torch reflector can be used to produce a parallel beam of light. Where is the bulb placed in relation to the torch reflector?
- (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.
- (a) With the help of a labelled diagram, explain how a concave lens perges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram.(b) State whether concave lens has a real focus or a virtual focus.(c) List some things that concave lens and concave mirror have in common.
- Draw a diagram to show how a converging lens held close to the eye acts as a magnifying glass. Why is it usual to choose a lens of short focal length for this purpose rather than one of long focal length?
- Fill in the following blanks with suitable words:(a) Parallel rays of light are reflected by a concave mirror to a point called the _______.(b) The focal length of a concave mirror is the distance from the _______ to the mirror.(c) A concave mirror _______ rays of light whereas convex mirror_______ rays of light(d) For a convex mirror, parallel rays of light appear to perge from a point called the _______.
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies