A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

Draw ray diagrams showing the image formation by a convex lens when an object is placed (e) at the focus of the lens

Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Find out the absolute refractive index of diamond.

Under which of the following conditions a concave mirror can form an image larger than the actual object?

Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus the building visible to her outside the window instead of the window pane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building? What is the approximate focal length of this lens?

Which of the following ray diagrams is correct for the ray of light incident on a lens shown in Fig. 10.7?

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (c) at centre of curvature of the mirror

A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under: Position of candle = 12.0 cm, Position of convex lens = 50.0 cm, Position of the screen = 88.0 cm. (iv) Draw a ray diagram to show the formation of the image in case (iii) as said above.

Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in Figure 10.6?

Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case. (a) Object is placed between device and its focus, image formed is enlarged and behind it.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (d) a little beyond centre of curvature of the mirror

A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as $A$, $B$, $C$ and $D$ in Figure 10.5. Which one of them is correct?

Which of the following statements is true?

Magnification produced by a rear view mirror fitted in vehicles

The laws of reflection hold good for

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (e) at infinity

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (b) between focus and centre of curvature of the mirror

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (a) between pole and focus of the mirror

Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of –50 cm. What is the nature of the lens and its power used by each of them?