Image Formed by a Concave Mirror

Q.

What can be the minimum distance between an object and its image formed by a concave mirror?
( $f$ is the focal length of the mirror)

1. $f$

2. $2f$

3. $\frac{f}{2}$

4. Zero

Q.

Draw a ray diagram to show the formation of image of an object placed beyond the centre of curvature of a concave mirror. State the position, size and nature of the image.

Q. The rays parallel to the principal axis of a concave mirror meet at .

1. focus
2. pole
3. centre of curvature

Q.

Draw a ray diagram to show the formation of image of an object placed between the pole and focus of a concave mirror. State the position, size and nature of the image.

Q.

A concave mirror is known as _____mirror.

Q. 1.A concave mirror has a radius of curvature 30 cm.How far must it be placed from a small object in order to give a five times magnified virtual image? 2.A concave mirror produces a real image of half thesize of an object placed at 60 cm infront of it. Whereshould the object be placed to obtain a virtual imageof double the size of the object

Q.

A concave mirror forms a real image of the same size as that of the object when the object is placed at:

1. At centre of curvature

2. Between focus and centre of curvature

3. Between pole and focus

4. At infinity

Q.

Concave mirror finds use in huge reflecting telescopes. Give reason.

Q. For an object, which of the following is true corresponding to the image formed by a concave mirror?

1. A real image is always diminished.
2. A virtual image is always magnified.
3. A virtual image is always inverted.
4. A virtual image cannot be formed.

Q.

Draw a ray diagram to show the formation of image of an object placed at the centre of curvature of a concave mirror. State the position, size and nature of the image.

Q.

Name the mirror which forms an erect, virtual and enlarged image of an object. What is the position of object relative to the mirror ?

Q.

If we want to form a virtual, erect and enlarged image of an object, then which mirror should we choose and where should we keep the object?

1. concave, centre of curvature

2. concave, beyond focus point

3. concave, between focus point and pole

4. convex, between focus point and pole

Q.

How is a spherical mirror used to converge a beam of light at a point ? Name the type of mirror used.

Q. By using a concave mirror, image of a tree is focused on a screen. Prove that the distance between the screen and the mirror is equal to twice the focal length of the concave mirror.

Q.

By using a concave mirror, image of a tree is focused on a screen. The distance between the screen and the mirror is ………

1. Equal to the radius of curvature of the mirror

2. Equal to half the radius of curvature of the spherical mirror

3. Equal to twice the focal length of mirror

4. Equal to one-fourth the focal length of the mirror

Q.

What is a real image ? Name the mirror which can be used to obtain the real image of an object. What should be the position of the object relative to the mirror.

Q. Match the object positions to the image positions of a concave mirror.

1. Between C and F
2. Beyond C
3. At infinity
4. At focus F

Q.

How can a concave mirror be used to obtain a virtual image of an object ? Draw a diagram to illustrate your answer.

Q. An object of length 6 cm is placed on the principal axis of a concave mirror of a focal length f at a distance of 4 f the length of the image will be

Q.

Name the kind of mirror used to obtain

(a) a real and enlarged image,

(b) a virtual and enlarged image,

(c) a real and diminished image, and

(d) a virtual and diminished image.

Q. 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 top.

1. Plane, convex and concave
2. Convex, concave and plane
3. Concave, plane and convex
4. Convex, plane and concave

Q.

If $x,y,z,t$denote object distance, image distance, focal length and radius of curvature in the case of a mirror respectively, $\frac{1}{x}+\frac{1}{y}=\frac{1}{z}=\frac{2}{t}$ is true for

1. convex mirror only

2. concave mirror only

3. plane mirror only

4. all types of mirror

Q. What will be the focal length of a spherical mirror if distance of object from the mirror is (30+-0.5)cm and distance of image from the mirror is (10+-0.2)cm?

Q.

It is said that, when light hits a mirror and reflects, our mind predicts that it might be coming from a point opposite to the mirror. But when we use a camera to capture a image in the mirror, we see same as we see from our eyes. Why camera captures the same we see since it don't have brain to make it predict that light is coming from some other point?

Q.

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

\( \Rightarrow \)

Q. If for a spherical mirror object dis†an ce is u, image dis†an ce is v and focal length is f then correct relation for magnification m is

Q. the distance between a real object of magnification 1 formed by a concave mirror of focal length f is

Q.

Choose the ray diagram which shows the image formation?

1. 

2. None of these

3. 

4. 

Q.

Draw a labeled ray diagram to show the image formed by a concave mirror. Also, write its position and nature when the object is placed between the centre of curvature and the focus.

Q.

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

1. 15 cm in front of the mirror

2. 30 cm in front of the mirror

3. More than 30cm in front of the mirror

4. Less than 30cm in front of the mirror