The image formed by a concave mirror is observed to be virtual, erect and larger than the object.Where should be the position of the object?

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

Which of the following statements is true?

Magnification produced by a rear view mirror fitted in vehicles

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

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

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

The following 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. 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?

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?

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

What is meant by power of a lens?

The speed of light in a transparent medium is 0.6 times that of its speed in vacuum. What is the refractive index of the medium?

The size of an object is 2 cm. The magnification produced by a mirror is +1. What is the size of the image?

How should a ray of light be incident on a rectangular glass slab so that it comes out from the opposite side of the slab without being displaced?

"The magnification 'm' for a mirror is +1." What does this signify?

A ray of light is incident on a convex mirror as shown. Redraw the diagram and complete the path of this ray after reflection from the mirror. Mark angle of incidence and angle of reflection on it.

Name the mirror that can give an erect and enlarged image of an object.

The refractive index of diamond is 2.42.What is the meaning of this statement?

Name the type of mirror used in the following situations. 
(a) Headlights of a car 
(b) Side/ rear-view mirror of a vehicle
(c) Solar furnace Support your answer with reason. 

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 is placed in each case for obtaining these images?

Mention the types of mirrors used as 
(i) rear view mirrors.
(ii) Shaving mirrors.
List two reasons to justify your answers in each case.

The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?

(i) One half of a convex lens of focal length 10 cm is convered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw ray diagram to justify your answer.
(ii) A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find nature, position and size of the image.

(a) Define optical centre of a spherical lens.
(b) A divergent lens has a focal length of 20 cm At what distance should an object of height 4 cm from the optical centre of the lens be placed so that its image is formed 10 cm away from the lens. Find the size of the image also.
(c) Draw a ray diagram to show the formation of image in above situation.

(a) One - half of a convex lens is covered with a black paper. Will such a lens produce an image of the complete object? Support your answer with a ray diagram.
(b) An object 5 cm high is held 25 cm away from a converging lens of focal length 10 cm.
(i) Draw the ray diagram and
(ii) Calculate the position and size of the image formed.
(iii) What is the nature of the image?