Q18 of 38 Page 79

A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

Since the image of her head is big, it means that the concave mirror has been used of higher focal length. The middle portion of the body of the child remains of same size which confirms the usage of plane mirror in the middle and in the bottom, the legs appears smaller which means that convex lens has been used in the bottom. So, the correct combination is: concave, plane mirror and convex mirror.

More from this chapter

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16

Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in Figure 10.6?

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 17

Which of the following ray diagrams is correct for the ray of light incident on a lens shown in Fig. 10.7?

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 19

In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

 20

Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case.

(a) Object is placed between device and its focus, image formed is enlarged and behind it.


(b) Object is placed between the focus and device, image formed is enlarged and on the same side as that of the object.


(c) Object is placed between infinity and device, image formed is diminished and between focus and optical center on the same side as that of the object.


(d) Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.