Spherical Mirrors

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

1. Plane mirror
2. Concave mirror
3. Convex mirror
4. (a) and (c) above.

Q.

What do you mean by linear magnification?

Q.

A converging mirror is known as___ .

Q.

Why are concave mirrors used in a telescope instead of using a plane mirror?

Q.

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

1. Concave mirror as well as convex lens

2. Convex mirror as well as concave lens

3. Two plane mirrors placed at 90° to each other

4. Concave mirror as well as concave lens

Q.

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

The object is placed between infinity and device, an image formed is diminished and between pole and focus, behind it.

Q.

Define magnification.

Q.

What is magnification in the below diagram?

Given OA = $10cm$ and O’A’ = $2cm$.

1. $-2$
2. $-10$
3. $5$
4. $-0.2$

Q.

A concave mirror is placed in water. Will there be any change in its focal length? Give reason.

Q.

What type of mirror – inner surface and the outer surface of the spoon acts as?

1. Inner – Concave; Outer - Convex

2. Inner – Convex; Outer - Concave

3. Inner – Concave; Outer - Concave

4. Inner – Convex; Outer - Convex

Q.

What are the uses of convex mirror?

Q.

What type of mirror is represented by the backside of a shining steel spoon?

Q. How to calculate the centre of the curvature of a spherical mirror and a parabolic mirror

Q.

Distinguish between the focus of a concave mirror and a convex mirror.

Q.

The mirror used in a dressing table is a

1. concave mirror

2. convex mirror

3. plane mirror

4. none of these

Q. An image formed by a concave mirror is $5$ times greater than the object. If the radius of curvature is $40cm$, determine the distance of the object from the mirror?

1. $4cm$
2. $8cm$
3. $16cm$
4. $32cm$

Q.

A person with defective eyesight is unable to see objects nearer than $150\mathrm{cm}$. He wants to read a book placed at a distance of $25\mathrm{cm}$. Find the nature, focal length, and power of lens he requires for his spectacles.

Q. The Laws of reflection are true for:

1. Concave mirrors only
2. Convex mirrors only
3. Plane mirrors only
4. Any reflecting surface

Q.

Why do we need ray diagrams? What rules should be followed while drawing ray diagrams?

Q.

What focal length can be assigned to a plane mirror?

Q.

The portion of the mirror from which the reflection of light actually takes place is _______.

Q.

Myopia is caused due to

1. High diverging power of the eye lens.

2. High converging power of the eye lens.

3. The blind spot on the retina.

4. None of the above.

Q.

Name the mirror whose focus is formed

a. in front of the mirror

Q.

A convex mirror has a wider field of view as compared to that of a concave mirror

1. True
2. False

Q.

If the radius of curvature of a concave mirror is 1 m, what is its focal length?

Q. ray diagram which show large field of view for convex mirror?

Q.

The focal length of a convex mirror is equal to its radius of curvature.

1. True
2. False

Q.

An object is kept at 60 cm in front of a plane mirror. If the mirror is now moved 25 cm away from the object, how does the image shift from its previous position?

Q.

Define magnification.

Q.

Which mirror is used by a dentist to focus light on the tooth of a patient?