1. Draw a diagram to show how a converging lens focusses parallel rays of light?
  2. How would you alter the above diagram to show how a converging lens can produce a beam of parallel rays of light.
Download our app for free and get startedPlay store
  1. When rays of light from a distant object pass through a converging lens, the light rays converge at the focus of lens.

A convex lens converges (brings closer) a parallel beam of light rays to a point F on its other side (right side).
  1. When rays of light come from the focus of lens, the emergent rays of light get parallel to the principal axis.
art

Download our app
and get started for free

Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*

Similar Questions

  • 1
    An object is placed at a distance of 100cm from a converging lens of focal length 40cm.
    1. What is the nature of image?
    2. What is the position of image?
    A convex lens produces an inverted image magnified three times of an object placed at a distance of 15cm from it. Calculate focal length of the lens.
    View Solution
  • 2
    A concave lens of focal length 15cm forms an image 10cm from the lens. How far is the object placed from the lens? Draw the ray-diagram.
    View Solution
  • 3
    Name the type of mirror used:
    1. By dentists.
    2. In solar furnaces. Give two reasons why such mirrors are used in each case.
    View Solution
  • 4
    State the laws of refraction of light. If the speed of light in vacuum is $3 \times 10^{8} \text{ ms}^{-1},$ find the speed of light in a medium of absolute refractive index 1.5.
    View Solution
  • 5
    An object is 2m from a lens which forms an erect image one-fourth (exactly) the size of the object. Determine the focal length of the lens. What type of lens is this?
    View Solution
  • 6
    The magnification of an image formed by a lens is –1. If the distance between the object and its image is 60cm, what is the distance of the object from the optical centre of the lens? Find the nature and focal length of the lens. If the object is displaced 20cm towards the optical centre of the lens, where would the image be formed and what would be its nature? Draw a ray diagram to justify your answer.
    View Solution
  • 7
    An object of 5.0cm size is placed at a distance of 20.0cm from a converging mirror of focal length 15.0cm. At what distance from the mirror should a screen be placed to get the sharp image? Also calculate the size of the image.
    View Solution
  • 8
    An object is placed between infinity and the pole of a convex mirror. Draw a ray diagram and also state the position, the relative size and the nature of the image formed.
    View Solution
  • 9
    Explain why, a stick half immersed in water appears to be bent at the surface. Draw a labelled diagram to illustrate your answer.
    View Solution
  • 10
    A concave lens has a focal length of 20cm. At what distance from the lens a 5cm tall object be placed so that it forms an image at 15cm from the lens? Also calculate the size of the image formed.
    View Solution