A student takes about 6 ml distilled water in four test tubes marked P, Q R and S. He dissolves sodium sulphate in P, potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. After that he adds equal amount of soap solution in each test tube. On shaking these test tubes, he would observe a good amount of lather in the test tubes marked; A. P and Q; B. Q and R; C. R and S; D. P .and S(All India - 2013)
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A student focussed the image of a distant object using a device 'X' on a white screen ... If the distance of the screen from the device is 30 cm, select the correct X ... What is meant by focallength of mirror?
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