Rainbow Formation

Q.

Which of the following phenomena of light are involved in the formation of a rainbow?

1. Reflection, refraction and dispersion

2. Refraction, dispersion and total internal reflection

3. Refraction, dispersion and internal reflection

4. Dispersion, scattering and total internal reflection

Q. Rainbow is formed due to:

1. total internal reflection
2. scattering
3. refraction
4. dispersion and total internal reflection

Q. How colour is created? why white light contains seven colors? how every object in earth absorb and emit only certain color which we able to see through our eyes?

Q. State any two difference between primary rainbow and secondary rainbow.

Q. (a) Define prism angle and angle of deviation for a prism.

Q. In a primary rainbow what is the order of colours observed from earth?

1. Violet innermost, Red outermost
2. Red innermost, Violet outermost
3. Random
4. White and dark alternatively

Q.

Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light is incident on one of its refracting surfaces. Also indicate the order of the colors of the spectrum obtained.

Q. Explain the physical phenomena involved in the formation of a rainbow with a diagram

Q. Explain the formation of a Rainbow.

Q. Rainbow is formed in which direction with respect to the sun?

1. Same direction
2. Opposite direction
3. Depends on the time of the day
4. North direction

Q. A passenger in an aeroplane shall

1. never see a rainbow.
2. may see a primary and a secondary rainbow as concentric circles.
3. may see a primary and a secondary rainbow as concentric arcs.
4. shall never see a secondary rainbow.

Q. Rainbow appears due to dispersion of sunlight by _____ .

1. Water droplets
2. Prism
3. Glass block
4. All

Q. (a) Name any two phenomena of light which cause the formation of a rainbow.
(b) A particular colour in the rainbow makes an angle of ${42.7}^o$ with the line of vision. What is the colour?
(c) What will be the shape of a rainbow when viewed from:
i. Terrace of a house?
ii. Aircraft flying very high.

Q.

1. The Sun should be behind us.
2. It should have rained and the Sun should be present.
3. None of A and B
4. Both A and B

Q. Fill in the blank.

1. dispersion
2. refraction
3. propagation
4. intensity

Q. Which of the following statement is wrong?

1. When the light rays undergo two internal reflections within a water drop, a secondary rainbow is formed
2. The order of colours is reversed in the secondary rainbow
3. An observer can see a rainbow when his front is towards the sun
4. Rainbow is a combined effect of dispersion, refraction and reflection of sunlight

Q. Which of the following statements are true?
a. The spectrum of sunlight has 7 colors.
b. Spectrum is seen due to bending of lights of different colors at different angles with respect to the incident ray through a prism.
c. Red light bends least whereas violet light bends the maximum.
d. Rainbow is an example of dispersion of light.

1. c and d
2. All of these
3. a, b and c
4. a, c and d

Q.

1. refraction, reflection, dispersion and total internal reflection
2. dispersion, refraction, reflection and total internal reflection
3. reflection, refraction, dispersion and total internal reflection
4. total internal reflection, refraction, dispersion and reflection

Q. Rainbow is formed due to which of the following?

1. By dispersion of sunlight through water droplets present in the atmosphere
2. None of the above
3. By reflection of sunlight through water droplets present in the atmosphere
4. By scattering of sunlight through water droplets present in the atmosphere

Q. After a storm, a man walks out onto his porch. Looking to the east, he sees a rainbow that has formed above his neighbor's house. What time of day it is?

1. Evening
2. Morning
3. Night
4. Dawn

Q. a) Is it correct to say that only red colour is given out from the water droplets situated on the outer edge of a rainbow? Justify your answer.
b) Write a situation in which a rainbow can be viewed as a full circle instead of an arc.

Q.

Match the statements of Column A with those of Column B.

Column A	Column B.
(A) Scattering (B) Total internal reflection (C) Refraction (D) Reflection	(a) Twinkling of stars (b) Formation of image by a plane mirror (c) Sparkling of diamond (d) Blue color of the sky

1. A→d; B→c; C→a; D→b

2. A→C; B→a; C→b; D→ d

3. A →a; B→b; C→d; D→(d)

4. A→b; B→d; C→C; D→a

Q. Fill in the blank.

1. outside
2. inside
3. below
4. beside

Q.

1. Reflection
2. Refraction
3. Dispersion
4. Scattering

Q. Secondary rainblow in the atmosphere is:

1. brighter than the primary rainbow
2. the result of polarization and dispersion of light
3. due to the phenomenon of double refraction
4. formed with red colour on the top
5. formed due to two reflections in the rain drop

Q. Rainbow is caused due to:

1. reflection of sunlight by air molecules
2. refraction of sunlight from water drops
3. dispersion of sunlight from water drops
4. refraction of sun rays by air molecules

Q. In secondary rainbow what is the order of colours observed from earth?

1. Violet innermost, Red outermost
2. Red innermost, Violet outermost
3. Random
4. White and dark alternatively

Q. Rainbows are caused due to:

1. dispersion of white light
2. reflection of white light
3. scattering of white light
4. none of these

Q. The word 'VIBGYOR' is made of the initial letters of the seven colours of the :

1. Prism
2. Red light
3. Shadow
4. Rainbow

Q. Colours of rainbow are in VIBGYOR sequence:

1. True
2. False