Spherical Mirror

Q.

Give two use each of a concave and a convex mirror.

Q. Which of the following types of mirror is used by the doctors for examining body parts like eyes?

1. Convex mirror
2. Plane mirror
3. Concave mirror
4. Diverging mirror

Q.

What Is the use of a concave mirror?

Q. Choose the correct statements based on the properties of light.

1. Light is a form of energy.

2. Light travels in a straight line.

3. Light can travel through vacuum.

4. Light travels in curved path.

Q.

The bulb used in a torch light is placed at a distance $x$ from the mirror used. The value of $x$ is

1. $f/2$

2. $f$

3. $f/3$

4. $3f$

Q.

The line joining the centre of curvature and the ___ of the mirror is called the principal Axis

1. Radius

2. Pole

3. Focus

4. Point of incidence

Q.

If the radius of curvature of a concave mirror is $36cm$, what is its focal length?

Q.

Focal length of a concave mirror depends on its

1. size.

2. aperture.

3. radius of curvature.

4. material used.

Q. In which of the following cases, irregular reflection is taking place?

1. 
2. 
3. 
4. 

Q.

A convex lens can be regarded as a set of prisms and a glass slab, such that refracting angle of the prisms

1. continuously decrease in outward direction

2. continuously increases in outward direction

3. remains same in outward direction

4. none of these

Q.

difference between concave and convex mirror

Q. A ray through the centre of curvature hitting the spherical mirror makes an angle ofwith the normal.

1. ${180}^{\circ }$
2. ${90}^{\circ }$
3. $0^{\circ }$
4. ${45}^{\circ }$

Q. The focal length is always the radius of curvature.

1. equal to
2. half of
3. three-fourth of

Q.

State the two kinds of spherical mirrors and distinguish them with the aid of proper diagrams.

Q.

Question 1 (b)
Fill in the blank:
Image formed by a convex __________ is always virtual and smaller in size.

Q.

The mirror does not change the direction in which light falls on it.

1. True
2. False

Q.

A spherical mirror is having radius of curvature $20$cm. Determine its focal length if mirror is (a) concave and (b) convex.

Q.

Moon is a luminous body in the sky.

1. True
2. False

Q.

What is the geometrical shape of the wavefront when a plane wave passes through a convex lens?

Q.

Which mirror which always forms a virtual image?

1. Concave

2. Convex

3. Both concave and convex

4. Neither concave nor convex

Q.

Optical fibre makes use of

1. 
2. 
3. 

4. 

Q. Which of the following is not a necessary requirement to see an object?

1. Eyes
2. Mirror
3. Light
4. Object

Q. What is a spherical mirror? Name different types of spherical mirrors.

Q.

Which of these is a converging mirror?

1. 

2. 

3. 

4. Both B and C

Q.

Which of the following is correct for the ray of light incident on a concave mirror

1. Light ray passing between focus and pole after reflection

2. Light ray passing through center of curvature after reflection

3. Light ray passing in the direction of incident ray parallel to principal axis

4. Light ray passing through focus after reflection.

Q.

A concave mirror can converge a parallel beam of light to a point. The reflection taking place, in this case, is a regular reflection.

1. True

2. False

Q.

Give one word for reflection from any rough surface.

Q.

We always use a convex mirror as the rear view mirror. What is/are the reason(s) for this?

1. It forms a diminished image.

2. It forms an erect image.

3. It forms an inverted image.

4. It forms an enlarged image.

Q.

A ray of light falling parallel to the principal axis on a convex mirror follows which of the following paths?

1. 1

2. 2

3. 3

4. 4

Q.

The focal length and radius of curvature are related by the formula

1. $f=2r$

2. $f=\frac{1}{r}$

3. $r=2f$

4. $r=\frac{f}{2}$