Image Formation by Concave Mirror

Q.

Why concave mirror is known as converging mirror

Q.

What is pole in physics?

Q.

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

Q.

Which of the following mirrors always forms a virtual and diminished image irrespective of object location?

1. concave

2. parabolic concave mirror

3. plane mirror

4. convex mirror

Q. A concave lens made of a material of refractive index $n_1$ is kept in a medium of refractive index $n_2$. A parallel beam of light is incident on the lens. Complete the path of rays of light emerging from the concave lens if:
(a) $n_1>n_2$ and (b) $n_1<n_2$.
[5 MARKS]

Q.

The linear magnification of a convex mirror is 12.5 cm. How far is its center of curvature (i) from the pole (ii) from the focus

Q.

Why do concave mirror converge parallel beams of light, and convex mirror do not ?

Q.

What is apparent shift ?

Q. If an object is placed at a distance of 9 cm from a concave mirror of focal length 10 cm then which type of image will be formed?

1. A diminished and real image.
2. A enlarge and real image.
3. A enlarge and virtual image.
4. A diminished and virtual image.

Q. The linear distance between the pole and the centre of curvature is called ___ .

Q.

The concave reflecting surface of a torch got rusted. What effect would this have on the beam of light from the torch?

Q. A concave mirror has a focal length of 14 cm. Where should an object be placed in the front of the concave mirror so as obtain an image which is real, inverted and same size as the object?

1. 14 cm
2. 20 cm
3. 34 cm
4. 28 cm

Q.

Where does object and the image coincide in a concave mirror

Q.

History Of Spherical Mirrors In Human Civilization.

Q.

You are provided with a concave mirror, a convex mirror, a concave lens, and a convex lens. To obtain an enlarged image of an object you can use either

1. Concave mirror or a Convex mirror

2. Concave mirror or Convex lens

3. Concave mirror or Concave lens

4. Concave lens or Convex lens.

Q. The type of mirror used by doctors to examine inner ear and teeth, is:

1. Convex
2. Plane
3. Cylindrical
4. Concave

Q. In the case of a mirror, match the items in column A with those in column B.
A B
1. Centre of curvature (a) centre of the mirror
2. Focus (b) centre of the sphere of which the mirror is a part
3. Radius of curvature (c) point through which all the incident rays parallel to principal axis pass after reflection
4. Principal axis (d) line joining the pole and focus
5. Pole (e) distance between pole and centre of curvature

1. 1 - c, 2 - b, 3 - a, 4 - d, 5 - e
2. 1 - b, 2 - c, 3 - e, 4 - d, 5 - a
3. 1 - b, 2 - c, 3 - a, 4 - e, 5 - d
4. 1 - e, 2 - c, 3 - b, 4 - d, 5 - a

Q. why is image formed when light rays intersect.cant an image be formed without intersection of light rays

Q. When a spherical mirror held towards the sun its sharp image is formed on a piece of carbon paper for same time, a hole is burnt in the carbon paper.

1. What is the nature of spherical mirror ?
2. Why is a hole burnt in the carbon paper ?
3. At which point of the spherical mirror the carbon paper is placed ?
4. What name is given to the distance between spherical mirror and carbon paper ?
5. What Is the advantage of using a carbon paper rather than a whit paper ?

Q.

The erect image formed by a concave mirror can be obtained on a screen.

1. True
2. False

Q.

Identify the condition, which will form a real, inverted and diminished image.

1. concave lens, object placed between focus F & pole O.

2. convex lens, object placed beyond 2F₁

3. convex lens, object placed between F₁ and 2F₁

4. concave mirror, object placed between C & F.

Q.

A concave mirror of small aperture forms a sharper image.

1. True
2. False

Q. What is converging and diverging rays?

Q. A square loop of wire of side 4 cm is placed 20 cm away from a concave mirror of focal length 8 cm.What is the area enclosed by the image of the wire(assume that the centre of the loop is on the axis of the mirror and the two sides are normal to the axis)?

Q. A person standing in front of a mirror finds his image larger than himself. This implies that the mirror is ___.

1. concave
2. cylindrical
3. plane
4. convex

Q.

What is principal axis?

1. Straight line passing through Centre of curvature and any point on the mirror

2. A line passing through focus and any point on the mirror

3. None of the above

4. Straight line passing through Centre of curvature and pole

Q. Convex mirrors has virtual focus and concave has real focus.

1. True
2. False

Q. Converging beam of light is:

1. when light is concentrated at a point
2. when light diverges from a point of source
3. when light bends its direction
4. when light scatters

Q.

The unit of magnification is

1. $m$

2. $m^2$

3. $m^{-1}$

4. none of these

Q. Explain the sign convention for spherical mirrors.