Draw ray diagrams for various following positions of the object to show the position and nature of the images :

When an object is at a certain fixed distance.

What do you mean by refraction? Write down the laws of refraction. Explain t5he laws of refraction with the help of a glass slab.

Draw ray diagrams for various following positions of the object to show the position and nature of the images :

(i) When an object is at infinity.

With the help of ray diagram for a concave lens explain the position of the image and its nature.

(i) When an object is placed at focus point.

(ii) When object is between F₁ and 2F₂

(iii) Object is between 2F₁ and infinity.

Explain with the help of ray diagram of convex lens to show the position of image and nature when object is placed :

between focus and optical centre.