Question

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

Answer

(c) Remains the same

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

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)

The total work done on a particle is equal to the change in its kinetic energy:
  1. Always.
  2. Only if the forces acting on it are conservative.
  3. Only if gravitational force alone acts on it.
  4. Only if elastic force alone acts on it.

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°

If ionisation potential of hydrogen atom is 13.6 eV , then its energy at $n=3$ :

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

How many capacitors having at least 2 µF capacitance will give 5 µF capacitance?

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