Make labelled ray diagrams to illustrate the formation of:(a) a real image by a converging mirror.(b) a virtual image by a converging mirror.Mark clearly the pole, focus, centre of curvature and position of object in each case.
(a) A real image is formed by a converging mirror when an object is placed anywhere between the focus $(F)$ and infinity, including the focus and infinity itself:
Here, P: pole, F: focus, C: centre of curvature, AB: object and A'B': image.
(b) A virtual image is formed by a converging lens when an object is placed between the pole $(P)$ and the focus $(F)$:
Here, P: pole, F: focus, C: centre of curvature, AB: object and A'B': image
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- (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.
- (a) Draw ray-diagrams to show the formation of images when the object is placed in front of a concave mirror (converging mirror): (i) between its pole and focus (ii) between its centre of curvature and focusDescribe the nature, size and position of the image formed in each case.(b) State one use of concave mirror based on the formation of image as in case (i) above.
- The image formed by a concave mirror is virtual, erect and magnified. The position of object is:(a) at focus (b) between focus and centre of curvature(c) at pole (d) between pole and focus
- An object is placed 15 cm from (a) a converging mirror, and (b) a perging mirror, of radius of curvature 20 cm. Calculate the image position and magnification in each case.
- Where would the image be formed by a convex mirror if the object is placed:(a) between infinity and pole of the mirror?(b) at infinity?Draw labelled ray-diagrams to show the formation of image in both the case.
- The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?$(a)$. Between the principal focus and the centre of curvature$(b)$. At the centre of curvature$(c)$. beyond the centre of curvature$(d)$. Between the pole of the mirror and its principal focus.
- (a) Construct ray diagrams to illustrate the formation of a virtual image using (i) a converging lens, and (ii) a perging lens.(b) What is the difference between the two images formed above?
- The image formed by a concave mirror is real, inverted and of the same size as the object. The position of the object must then be:(a) at the focus (b) between the centre of curvature and focus(c) at the centre of curvature (d) beyond the centre of curvature
- 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).
- The image formed by a concave mirror is real, inverted and highly diminished (much smaller than the object). The object must be:(a) between pole and focus (b) at focus(c) at the centre of curvature (d) at infinity
- A concave mirror produces magnification of +4. The object is placed:(a) at the focus (b) between focus and centre of curvature(c) between focus and pole (d) beyond the centre of curvature
- With the help of a labelled ray diagram, describe how a converging mirror can be used to give an enlarged upright image of an object.
- What is the minimum number of rays required for locating the image formed by a concave mirror for an object? Draw a ray diagram to show the formation of a virtual image by a concave mirror.
- (a) Draw a labelled ray diagram to show the formation of image in a convex-mirror when the object is at infinity. Mark clearly the pole and focus of the mirror in the diagram.(b) State three characteristics of the image formed in this case.(c) Draw diagram to show how a convex mirror can be used to give a large field of view.
- (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.
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