NCERT Exemplar solutions for Science [English] Class 10 chapter 10 - Light – Reflection and Refraction [Latest edition]

Which of the following can make a parallel beam of light when light from a point source is incident on it?

A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

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

Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is

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

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 Figure Which of the following could be inside the box?

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. Which of the following could be inside the box?

Which of the following statements is true?

Magnification produced by a rear view mirror fitted in vehicles

Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

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

In torches, search lights and headlights of vehicles the bulb is placed ______.

The laws of reflection hold good for

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 Which one of them is correct?

A	B	C	D

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?

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

Fig. A	Fig. B	Fig. C	Fig. D

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

Fig. A	Fig. B	Fig. C	Fig. D

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.

In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

Identify the device used as a spherical mirror or lens in following case, when the image formed is virtual and erect in case.

Object is placed between device and its focus, image formed is enlarged and behind it.

Identify the device used as a spherical mirror or lens in following case, when the image formed is virtual and erect in case.

Object is placed between the focus and device, image formed is enlarged and on the same side as that of the object.

Identify the device used as a spherical mirror or lens in following case, when the image formed is virtual and erect in case.

Object is placed between infinity and device, image formed is diminished and between focus and optical centre on the same side as that of the object.

Identify the device used as a spherical mirror or lens in following case, when the image formed is virtual and erect in case.

Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.

A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine. Support your answer with reason.

How is the refractive index of a medium related to the speed of light? Obtain an expression for refractive index of a medium with respect to another in terms of speed of light in these two media?

Draw a ray diagram showing the path of rays of light when it enters with oblique incidence

1. from air into water;
2. from water into air.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed

1.  between pole and focus of the mirror
2. between focus and centre of curvature of the mirror
3. at centre of curvature of the mirror
4. a little beyond centre of curvature of the mirror
5. at infinity

Draw ray diagrams showing the image formation by a convex lens when an object is placed

1. between optical centre and focus of the lens
2. between focus and twice the focal length of the lens
3. at twice the focal length of the lens
4. at infinity
5. at the focus of the lens

Draw ray diagrams showing the image formation by a concave lens when an object is placed

1. at the focus of the lens
2. between focus and twice the focal length of the lens
3. beyond twice the focal length of the lens

Draw ray diagrams showing the image formation by a convex mirror when an object is placed

1. at infinity
2. at finite distance from 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

1.  What is the focal length of the convex lens?
2. Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?
3. What will be the nature of the image formed if he further shifts the candle towards the lens?
4. Draw a ray diagram to show the formation of the image in case (iii) as said above.