Draw a ray diagram to show the formation of a real magnified image by a convex lens. (In your sketch the position of object and image with respect to the principal focus of lens should be shown clearly).
Formation of a real magnified image by a convex lens when the object is placed between $F'$ and $2F'$ (or between $f$ and $2f$).
Explanation
When an object is placed between $F'$ and $2F'$, means the object is at a distance greater than the focal length $f$ and less than twice the focal length $2f$, then the image formed is real, inverted, larger than the object (or magnified), and beyond the $2F$ on the other side of the lens.
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- (a) Explain why, a real image can be projected on a screen but a virtual image cannot.(b) Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.(c) Name one simple optical instrument in which the above arrangement of convex lens is used.
- (a) Explain what is meant by a virtual, magnified image.(b) Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.(c) Three convex lenses are available having focal lengths of 4 cm, 40 cm and 4 m respectively. Which one would you choose as a magnifying glass and why?
- (a) An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how the image is formed, and say whether the image is real or virtual.(b) What is the effect on the size and position of the image of moving the object (i) towards the lens, and (ii) away from the lens?
- An object placed 4 cm in front of a converging lens produces a real image 12 cm from the lens.(a) What is the magnification of the image?(b) What is the focal length of the lens?(c) Draw a ray diagram to show the formation of image. Mark clearly F and 2F in the diagram.
- If the image formed by a convex lens is of the same size as that of the object, what is the position of the image with respect to the lens?
- An object is placed at a distance equal to 2f in front of a convex lens. Draw a labelled ray diagram to show the formation of image. State two characteristics of the image formed.
- Where should an object be placed in front of a convex lens to get a real image of the size of the object?(a) At the principal focus of the lens(b) At twice the focal length(c) At infinity(d) Between the optical center of the lens and its principal focus.
- (a) Draw a labelled ray diagram to show the formation of image of an object by a convex mirror. Mark clearly the pole, focus and centre of curvature on the diagram.(b) What happens to the image when the object is moved away from the mirror gradually?(c) State three characteristics of the image formed by a convex mirror.
- Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image?
- Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens when an object is placed beyond 2f in front of the lens.
- Draw ray diagram to show the principal focus of a:(i) concave mirror(ii) convex mirror
- (a) Explain with the help of a diagram, why the convex lens is also called a converging lens.(b) Define principal axis, principal focus and focal length of a convex lens.
- For what position of an object a real, diminished image is formed by a convex lens?
- Draw a ray diagram in each of the following cases to show the formation of the image, when the object is placed :(i) between optical centre and principal focus of a convex lens.(ii) anywhere in front of a concave lens.(iii) at 2F of a convex lens.State the signs and values of magnifications in the above mentioned cases (i) and (ii).
- (a) For which position of an object, a real, diminished image is formed by a convex lens?(b) Two convex lenses A and B have focal lengths of 2.5 cm and 12.0 cm, respectively. Which lens has a greater power? (c) Describe with the help of a labelled ray-diagram, the formation of image when an object is placed in front of a convex lens between focus and optical centre. State any two characteristics of the image formed.
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