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Background image or text in a document is known as______.

In roasting I. no metal impurities are removed. II. ores becomes porous III. moisture is removed. Which of the above facts are true about roasting ?

The image is formed on the object itself on the given arrangement. If mirror is removed. What is the distance between the object and the image?

Which of the following statement(s) is/are correct? I Conductivity arises from mobile charge carriers. II In metals, these mobile charge carriers are electrons with fixed positive ions in background.

(ii) If a - sign precedes a symbol of grouping the grouping symbol may be removed and the sign of each term is changed.

A thin converging lens with focal length f = 25 cm projects the image of an object on a screen removed from the lens by a distance l == 5.0 m . Then the screen was draws closer to the lens by a distance Delta l = 18 cm . By what distance should the object be shifted for its image to become sharp again ?