Q12 of 38 Page 79

In torches, search lights and headlights of vehicles the bulb is placed

Since light rays when falls on a mirror, they become parallel to the principal axis and we get a concentrated light ray. This is the reason why the bulb is placed very near to the focus of the reflector or mirror.

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The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in Figure 10.5. Which one of them is correct?