You are given a prism in which the two refracting surfaces are at `90^@` with each other. Draw ray diagrams using this prism so that
the image of an object is rotated by `90^@`

You are given a prism in which the two refracting surfaces are at 90^@ with each other. Draw ray diagrams using this prism so that the image of the object is rotated by 180^@ .

We wish to obtain an erect image of an object, using a concave mirror of focal length 15cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.