Dispersion of White Light through Prism

Q.

Question 5

A rainbow can be seen in the sky

(a) when the sun is in front of you.

(b) when the sun is behind you.

(c) when the sun is overhead.

(d) only at the time of sun rise.

Q. Difference between refraction and dispersion

Q. When white light is passed through a prism it splits into colours.

1. seven
2. three
3. one
4. eight

Q. Blue light is made to fall on a prism. What colour would you observe on the other side of the prism?

1. Blue light
2. Can’t say
3. Band of seven colors
4. White light

Q.

Which type of lens forms always a virtual image?

Q. Which among the following disc's appear white when it is roataing.

1. Aristotle's disc
2. Faraday's disc
3. Galileo's disc
4. Newton's disc

Q.

A disc in which seven rainbow colours equally spread over an area, which on rotation, fades to white colour is called:

1. Newton’s disc

2. Faraday’s disc

3. Galileo’s disc

4. Rutherford’s disc

Q. Why light is dispersed only in prism, not in lenses?

Q.

Question 15

State the correct sequence (1-7) of colours in the spectrum formed by the prisms A and B, shown in Figure.

Q. The splitting of white light when it passes through a prism is known as .

1. dispersion
2. reflection
3. refraction

Q.

Why cannot the white light be having Vibgyor in air? Why only when the light passes through two mediums?

Q.

Question 14

Boojho shines monochromatic light from a laser torch on a prism. Will he be able to observe a band of seven colours? Explain with a reason.

Q.

State three characteristics of the image of an extended source, formed by a concave lens.

Q. Why does a rainbow bend?

Q.

A concave lens always gives

1. virtual image

2. erect image

3. diminished image

4. all of these

Q. _________ discovered that white light consists of seven colours.

1. Walt Disney
2. Frank Starling
3. Laplace
4. Sir Isaac Newton

Q.

How will you prepare magenta colour?

Q.

Explain the process of color subtraction?

Q. Primary colours are
(a) red, blue, yellow
(b) red, yellow, magenta
(c) red, blue, green
(d) black and white

Q.

Which of following statement(s) is/are true with respect to a prism if 'i' is the incident light ray and the dotted line shows the normal to the point where light strikes?

1. It creates colors of its own

2. It bends light falling on it towards its base

3. It bends lights of different colors by same amount

4. All of these

Q. When light or we can say the white light is passed through a triangular prism, which of the following colour light will bent the least?

1. Orange
2. Green
3. Red
4. Yellow

Q.

A prism disperses light, but a rectangular glass slab does not. Why?

Q.

Each question contains Statement I (Assertion) and Statement II (Reason). Each question has 4 choices (a), (b), (c), and (d) out of which ONLY ONE is correct. So, select the correct choice.

Assertion-Reason

Statement I: A convex lens forms a real image of a real-extended object.

Statement II: A convex lens is an example of a spherical lens and is converging in nature.

1. Statement I is True, Statement II is True; Statement II is a correct explanation for Statement I

2. Statement I is True, Statement II is True; Statement II is NOT a correct explanation for Statement I

3. Statement I is True, Statement II is False

4. Statement I is False, Statement II is True

Q. What are the different colours that make up white light? [2 MARKS]

Q. Which of the following sources of light is different from others ?

1. Sunlight
2. White light
3. Sodium light
4. Light from a bulb

Q.

When light or we can say the white light is passed through a triangular prism, ___colour light will bent the least.

Q. A laser light from a laser torch was made to fall on a prism. Will a band of 7 colours be observed ? Explain.

Q. White colour consists of _____ colours.

1. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> One
2. Four
3. Five
4. Seven

Q. Write true or false for the following statements :
Light coming from the sun is white light and contains seven colors.

1. True
2. False

Q. Which colour of light is obtained when we mix beams of light of all seven colours of a rainbow?

1. Blue
2. Green
3. Red
4. White