Lakhmir Singh and Manjit Kaur Solutions for Chapter: Refraction of Light, Exercise 13: Long Answer Type Questions

An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how the image formed, and say whether the image is real or virtual.

What is the effect on the size and position of the image of moving the object towards the lens.

What is the effect on the size and position of the image on moving the object away from the lens?

Explain what is meant by a virtual, magnified image.

Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.

Three convex lenses are available having focal lengths of $4 \mathrm{cm}, 40 \mathrm{cm}$ and $4 \mathrm{m}$ respectively. Which one would you choose as a magnifying glass and why?

Explain why, a real image can be projected on a screen but a virtual image cannot.

Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.