Both concave and convex lenses are used in spectacles to correct eye-sight. Do you agree with the statement. Explain your reason.

Draw ray diagrams of convex lens when the position of the object is at infinity.

Draw a ray diagrams of convex lens when the position of the object is between ${\mathrm{F}}_1$ and $2{\mathrm{F}}_1$.

Draw a ray diagrams of convex lens when the position of the object is at $2 {\mathrm{F}}_1$.

Define the terms converging and diverging lenses.