When the reflecting or refracting rays do not actually intersect but appear to intersect when produced backwards,
Explanation:
A virtual image is formed when the refracting or reflecting rays do not actually intersect but appear to intersect when they are produced backwards.
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The minimum distance between an object and its real image formed by a convex lens is
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(a) 1.5 f |
(b) 2 f |
(c) 2.5 f |
(d) 4 f |
In Young’s double slit experiment, distance between two sources is 0.1 mm. The distance of screen from the sources is 20 cm. Wavelength of light used is 5460 Å. Then angular position of the first dark fringe is
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(a) 0.08° |
(b) 0.16° |
(c) 0.20° |
(d) 0.313° |
Two bar magnets with magnetic moments 2 M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth’s magnetic field with magnet having magnetic moment 2M making and angle q with the magnetic meridian such that
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(a) θ = |
(b) θ = |
(c) θ = |
(d) θ = |
If M is the atomic mass and A is the mass number, packing fraction is given by
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(a) |
(b) |
(c) 
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(d) 
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Assertion : Penetrating power of X-rays increases with the increasing the wavelength.
Reason : The penetrating power of X-rays increases with the frequency of X-rays.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If assertion is false but reason is true. |
