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Recent questions tagged telegram-1606

(chatquestion)...5. An n digit number is a positive number with exactly n digits. Nine hundred distinct n-digit numbers are to be formed using only the three digits 2, 5 and 7. The smallest value of n for which this is possible is (а) 6 (b) 7 (c) 8 (d) 9

asked May 24, 2020 by balaji.thirumalai

1 answer

(chatquestion)...A lens forms a real image of an object on a screen placed at a distance of 100 cm from the screen. If the lens is moved by 20 cm towards the screen, another image of the object is formed on the screen. What is the focal length of the lens ? [Ans. 24 cm]

asked Apr 5, 2020 by balaji.thirumalai

1 answer

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