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You are given 3 lenses l1,l2,l3 each of focal length 20 an object at 40cm in front of l1.the final real image is formed at focus i ofl3,find separation between l1,l2,l3 ?Ans) between l1&l2 its 60 & between l2&l3 it can be any value...........for l3 to form image at i, the object must be at infinity, and for that, image formedby l1 must be at the focus of l2,and also image formed by l1 is 40 cm ahead of l1, i.e., the focus of l2(20 cm)so, distance between l1 and l2 is 40+20=60 cm........
What is an effect wheel? A disc of polycarbonate or metal revolving among the lamp and the common end along with holes, slits, patterns or colors.
Q. Which of the following isn't true of Guglielmo Marconis experiments on wireless transmission Answer:- A) In 1901 he broadcasted a signal from Newfoundland to England
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Defects of Vision Long Sightened When a person can see far objects clearly but cannot see near object clearly then this defect of vision is called as long sightedness.
A mass floats with 1/3rd of its volume outside water what will be its relative density? Ans) 8/3 g/cc
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Pauli exclusion principle (W. Pauli; 1925) No two similar fermions in a system, like electrons in an atom, can have an equal set of quantum numbers.
why dark spot appears on newton''s ring?
The speed at which a wave propagates down a string is 300 meters per second. If the frequency of this wave is 150 Hertz, what is the wavelength of this wave? Ans: The wavel
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