The radius of curvature of a concave mirror is twice its focal length.

Power of a convex lens is negative and that of a concave lens is positive.

The radius of curvature of a plane mirror is infinity.

When a ray of light passes from an optically denser medium to an optically rarer medium, an angle of refraction is greater than the corresponding angle of incidence.

If the velocity and acceleration have opposite sign, then the object is slowing down.

If the velocity is zero at an instant, then the acceleration should also be zero at that instant.

If the velocity is zero for a time interval, then the acceleration is zero at any instant within the time interval.

If the position and velocity have opposite sign, then the object is moving towards the origin.

10$$\Omega$$

30$$\Omega$$

270$$\Omega$$

810$$\Omega$$

AB

BC

CD

None of these