Correct the following sentences if required:
The focal length of a concave mirror changes when immersed in water.

Correct the following sentences if required: The power of a lens is numerically equal to its focal length.

Correct the following sentences if required: Second law of reflection (i.e. anglei = angle r) is obeyed due to reflection from plane mirror only.

Correct the following sentences if required: A plane mirror is a better reflector than a right angled prism.

Correct the following sentences if required: The reflected ray is found to rotate through an angle of 60^@ . Then the plane mirror must have rotated through 120^@ .

Correct the following sentences if required: The images formed due to reflection from a spherical (concave/ convex) mirror are laterally inverted.