Find the position, nature and size of the image of an object 3 cm high place at a distance of 9 cm from a concave mirror of focal length 18 cm.

Discuss the position and nature of the image formed by a concave mirror when the object is moved from infinity towards the pole of mirror.

Figure below shows an object AB placed on the principal

axis of a convex lens placed in air. F₁ and F₂ are the two foci of the lens. Copy the diagram. (i) Draw a ray of light starting from B and passing through O. Show the same ray after refraction by the lens. (ii) Draw another ray from B which passes through F₂ after refraction by the lens. (iii) Locate the final image formed. (iv) Is the image real or inverted?

With the help of ray diagrams, show the formation of image of an object by a concave mirror. When it is placed: (i) beyond the centre of curvature (ii) at the centre of curvature.

Multiple images are formed by a thick plane mirror. Which of the following is the brightest of all the images?