An object is placed at the principal axis of the convex lens between infinity and 2F₁. Explain the position of the image by ray diagram.

What are Presbyopia and Astigmatism?

What do you mean by the power of accommodation and vision range of eye?

Draw the ray diagram for the concave mirror in the following position of the object to show the position and nature of the image :

When an object is between infinity and radius of curvature.

Draw the ray diagram for the concave mirror in the following position of the object to show the position and nature of the image :

When an object is at the center of curvature.