A 5.0cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20cm. The distance of the object from the lens is 30cm By calculation determine.

1. The position and
2. The size of the image formed.

Give two uses of concave mirrors. Explain why you would choose concave mirrors for these uses.

With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is.

A concave mirror produces a real image 1cm tall of an object 2.5mm tall placed 5cm from the mirror. Find the position of the image and the focal length of the mirror.

A mirror forms an image which is 30cm from an object and twice its height.

1. Where must the mirror be situated?
2. What is the radius of curvature?
3. Is the mirror convex or concave?

An object is placed at a distance of 100cm from a converging lens of focal length 40cm.

1. What is the nature of image?
2. What is the position of image?

A convex lens produces an inverted image magnified three times of an object placed at a distance of 15cm from it. Calculate focal length of the lens.

Find the position and size of the virtual image formed when an object 2cm tall is placed 20cm from:

1. A diverging lens of focal length 40cm.
2. A converging lens of focal length 40cm.

A converging lens of focal length 5cm is placed at a distance of 20cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen?

An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.

A small object is so placed in front of a convex lens of 5cm focal length that a virtual image is formed at a distance of 25cm. Find the magnification