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.

A beam of light is incident through the holes on side $A$ and emerges out of the holes on the other face of the box as shown in the Figure 10.4. Which of the following could be inside the box?

Write laws of refraction. Explain the same with the help of ray diagram, when a ray of light passes through a rectangular glass slab.

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?

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

Beams of light are incident through the holes $A$ and $B$ and emerge out of box through the holes $C$ and $D$ respectively as shown in the Figure10.3. Which of the following could be inside the box?

                                          

 

A light ray enters from medium A to medium B as shown in Figure 10.2. The refractive index of medium B relative to A will be

You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?

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

How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?

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. (ii) Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?

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?

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

Under what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be angle of incidence. Show the same with the help of diagram.

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. (i) What is the focal length of the convex lens?

The laws of reflection hold good for

A full length image of a distant tall building can definitely be seen by using

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.

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. (iii) What will be the nature of the image formed if he further shifts the candle towards the lens?

Draw ray diagrams showing the image formation by a convex mirror when an object is placed (b) at finite distance from the mirror