Q19 of 38 Page 79

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

When the object is placed at infinity, then the incident rays fall parallel on the principal axis, which on after reflection by a concave mirror, convex mirror and convex lens passes through the focus of the reflector. The image thus obtained is diminished and point sized.

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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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 18

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.

 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.

 21

Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to itself? Explain using a diagram.