When a plane mirror is rotated through an angle θ then the reflected ray turns through the angle 2θ then the size of the image
| (a) Is doubled | (b) Is halved | (c) Remains the same | (d) Becomes infinite |
When a plane mirror is rotated through an angle θ then the reflected ray turns through the angle 2θ then the size of the image
| (a) Is doubled | (b) Is halved | (c) Remains the same | (d) Becomes infinite |
(c) Remains the same
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When a dielectric material is introduced between the plates of a charged condenser then electric field between the plates
|
(a) Decreases |
(b) Increases |
(c) Remain constant |
(d) First (b) then (a) |
Light rays from a source are incident on a glass prism of index of refraction μ and angle of prism α. At near normal incidence, the angle of deviation of the emerging rays is
|
(a) (μ – 2)α |
(b) (μ – 1) α |
(c) (μ + 1) α |
(d) (μ + 2) α |
A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown in figure. Let
be the potentials at points A, B and C respectively. Then

|
(a) |
(b) |
(c) |
(d) |
A normally incident ray reflected at an angle of 90°. The value of critical angle is
|
(a) 45° |
(b) 90° |
(c) 65° |
(d) 43.2° |
When the N-pole of a bar magnet points towards the south and S-pole towards the north, the null points are at the
| (a) Magnetic axis |
(b) Magnetic centre |
| (c) Perpendicular divider of magnetic axis | (d) N and S poles |
A group of N cells whose emf varies directly with the internal resistance as per the equation EN = 1.5 rN are connected as shown in the figure below. The current I in the circuit is

|
(a) 0.51 amp |
(b) 5.1 amp |
(c) 0.15 amp |
(d) 1.5 amp |
A convex mirror has a focal length f. A real object is placed at a distance f in front of it from the pole produces an image at
|
(a) Infinity |
(b) f |
(c) f/2 |
(d) 2f |