Reflection

Q.

The bouncing back of light from a shiny surface is called as ___________.

1. refraction

2. absorption

3. reflection

4. diffraction

Q.

A spherical mirror, whose inner surface is the reflecting surface, is a

1. Concave mirror.

2. Convex mirror.

3. Parabolic mirror.

4. Plane mirror.

Q.

Why do we see our image in a plane mirror?

Q. How is can we prove that angle of reflection = angle of incidence?

Q.

An observer moves towards a stationary plane mirror at a speed of $4m/s$ the speed of image with respect to mirror is __________

Q.

Reflection only takes place on smooth surface.

1. True

2. False

Q.

What are light reflection and refraction?

Q. Why light is called light and not something else?

Q.

We can see objects when light reflects and fall on our eyes. Why can't wall act as a mirror since it also reflects light and fall on our eyes?

Q.

What is a spherical mirror, whose inner hollow surface is the reflecting surface, called?

Q. Light rays while entering a denser medium from a rarer medium, gets slowed down which is why bends towards the normal and vice-versa.

1. False
2. True

Q.

Our shadows are longer in the morning and evening. Why?

1. In the evening and the morning the angle of elevation from the Sun is low

2. During morning and evening, the angle of incident light is very small

3. In the evening and morning we become longer in size

4. Both B & C

Q.

Two plane mirrors subtend an angle$\theta$. Light incident on one mirror after reflection from the other mirror returns parallel to the original direction. The angle$\theta$must be

1. ${30}^o$

2. ${45}^o$

3. ${60}^o$

4. ${90}^o$

Q.

The image formed by a plane mirror is________.

1. All of the above

2. Erect

3. Virtual

4. Laterally inversed

Q. A man sees a stone at the bottom of a pool of water. Which path could be taken by light from the stone to the man?

1. A
2. B
3. C
4. D

Q.

Who discovered light ?

Q.

The amount of light reflected depends upon:

1. the nature of the surface

2. the smoothness of the surface

3. all of the above

4. the nature of material of the object

Q. A is thicker at the center than the edges.

1. concave lens
2. convex lens
3. glass slab

Q.

In a Young’s double slit experiment $15$ fringes are observed on a small portion of the screen when light of wavelength $500nm$ is used. $10$ fringes are observed on the same section of the screen when another light source of wavelength λ is used. Then the value of λ is (nm)

Q.

Diffused reflection takes place on rough surfaces. Why?

Q.

What is the purpose of a microscopes mirror?

Q. We can see an object when it _____.

1. has bright color
2. has shiny surface
3. reflects or emits light
4. reflects or absorbs light

Q. Two plane mirrors are inclined at an angle $80$ degrees. A Ray of light is incident on one of the Mirrors. The ray after two reflection will undergo total deviation of:

1. $180$ degrees
2. $160$ degrees
3. $200$ degrees
4. $240$ degrees

Q. It is said that light travels in a straight line. How will you prove this?

Q. Explain the laws of the concave and convex mirror.

Q. What do you mean by multiple reflections?

Q. State two uses each of : plane mirror

Q. A convex mirror always produces a/an ______ image.

1. inverted
2. virtual
3. magnified
4. real

Q.

Newton used corpuscular theory (of light) to explain the reflection and refraction of light.

1. True
2. False

Q. A plane mirror makes an angle of ${30}^o$ with horizontal. If a vertical ray strikes the mirror, find the angle between mirror and reflected ray.

1. $30$
2. $45$
3. $60$
4. $90$