Define with diagram the principal axis of convex lens.

An object of size 5cm is placed on the principal axis of a convex mirror at a distance of 10cm from it . The focal length of the convex mirror is 20cm. Determine the nature, position and size of the image formed.

A particle executes simple harmonic motion along principle axis of a convex lens of focal length f with amplitude ‘a’. The centre point of the motion is at a distance ‘b’ from the lens. Find the amplitude of oscillation of the image.

The image of an extended object, placed perpendicular to the principal axis of a mirror will be erect if

What is meant by the optical centre of a convex lens?

An object is placed in between the optical centre and focus of a thin convex lens. What is the nature of image of the object?

The reflecting surfaces of a concave mirror and a convex mirror are separated by a distance of 35 cm. The radius of curvature of the tow mirrors are 15 cm and 25 cm respectively. An object of height 3 cm is placed vertically on the principal axis 10 cm from the concave mirror. If the first reflection takes place in the concave mirror and then in the convex mirror, determine the position , nature and size of the final image formed.

An object is placed in front of a convex mirror on the principal axis. With the help of a ray diagram show the position of the image.

How can an erect and magnified image be formed with the help of a convex lens? With the help of diagram which type of lens long-sightedness can be rectified?