eVidyarthi
Menu
  • School
    • Close
    • CBSE English Medium
    • CBSE Hindi Medium
    • UP Board
    • Bihar Board
    • Maharashtra Board
    • MP Board
    • Close
  • Sarkari Exam Preparation
    • Close
    • Notes For Competitive Exams
    • MCQs for Competitive Exams
    • All Govt Exams Preparation
    • NCERT Syllabus for Competitive Exam
    • Close
  • Study Abroad
    • Close
    • Study in Australia
    • Study in Canada
    • Study in UK
    • Study in Germany
    • Study in USA
    • Close
Science Class 10 Maharashtra Board | Menu
  • MCQ Science Class 10 Maharashtra Board
  • Book Science Class 10 Maharashtra Board
  • Question Answers Science Class 10 Maharashtra Board
  • Notes Science Class 10 Maharashtra Board
  • Important Questions Science Class 10 Maharashtra Board
  • Science Class 10

Science and Technology Part I Class 10 Chapter 6 Question Answers Maharashtra Board

Refraction of light – Solutions


Question 1.
Fill in the blanks and explain the completed statements:


a. Refractive index depends on the………….of light.

Answer:
Refractive index depends on the velocity of light.
It is an experimental fact. (There is no question of explanation.)

b. The change in…………of light rays while going from one medium to another is called refraction.

Answer:
The change in the direction of propagation of light rays while going from one medium to another is called refraction. This is definition of refraction. It is assumed that the ray of light passes obliquely from one medium to another. (There is no question of explanation.)


Question 2.
Prove the following statements:


a. If the angle of incidence and angle of emergence of a light ray falling on a glass slab are i and e respectively, prove that i = e. 

Answer:

In the following figure, SR || PQ and NM is the refracted ray. Hence, r = i1.
Now gna = sin i/sin r and ang = sin i1/ sin e.


b. A rainbow is the combined effect (an exhibition) of the refraction, dispersion, and total internal reflection of light (taken together). (Practice Activity Sheet – 1)
(OR)
With a neat labelled diagram, explain how the formation of rainbow occurs.

Answer:

(1) The formation of a rainbow in the sky is a combined result of refraction, dispersion, internal reflection and again refraction of sunlight by water droplets present in the atmosphere after it has rained.

Here, for simplicity only violet and red colours are shown. The remaining five colours lie between these two.

(2) The sunlight is a mixture of seven colours: violet, indigo, blue, green, yellow, orange and red. After it has stopped raining, the atmosphere contains a large number of water droplets. When sunlight is incident on a water droplet, there is (i) refraction and dispersion of light as it passes from air to water (ii) internal reflection of light inside the droplet and (iii) refraction of light as it passes from water to air.

(3) The refractive index of water is different for different colours, being maximum for violet and minimum for red. Hence, there is dispersion of light (separation into different colours) as it passes from air to water. [ See above Figure for reference.]

(4) The combined action of different water droplets, acting like tiny prisms, is to produce a rainbow with red colour at the outer side and violet colour at the inner side. The remaining five colours lie between these two.
The rainbow is seen when the sun is behind the observer and water droplets in the front.


Question 3.
Mark the correct answer in the following questions :


A. What is the reason for the twinkling of stars?

(i) Explosions occurring in stars from time to time
(ii) Absorption of light in the earth’s atmosphere
(iii) Motion of stars
(iv) Changing refractive index of the atmospheric gases

Answer:

Changing refractive index of the atmospheric gases.

B. We can see the Sun even when it is little below the horizon because of

(i) reflection of light
(ii) refraction of light
(iii) dispersion of light
(iv) absorption of light

Answer:

refraction of light

C. If the refractive index of glass with respect to air is 3/2, what is the refractive index of air with respect to glass?

(i) 1/2
(ii) 3
(iii) 1/3
(iv) 2/3

Answer:

(iv) 2/3


Question 4.
Solve the following examples:


a. If the speed of light in a medium is 1.5 × 108 m/s, what is the absolute refractive index of the medium? (Practice Activity Sheet – 1 and 4)

Solution:

This is the absolute refractive index of the medium.

b. If the absolute refractive indices of glass and water are 3/2 and 4/3 respectively, what is the refractive index of glass with respect to water?

Solution:

This is the refractive index of glass with respect to water.

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Ads

HSC Maharashtra – Marathi Medium – Maharashtra Board

📘 Maharashtra Board Exam Resources (Marathi Medium)

  • Maharashtra Board Question Banks (Marathi)
  • Maharashtra Board Sample Papers in Marathi Medium
  • Previous Year Question Papers – Marathi Medium
  • Marathi Notes and Practice Mock Tests for SSC/HSC
  • Includes MCQs (Multiple Choice Questions) in Marathi
  • All resources are available in Marathi Medium

📗 Maharashtra Board Textbooks & PDFs (Marathi Medium)

  • 10th Standard Textbook PDF in Marathi
  • Class-wise Textbook PDF (Marathi Medium)
  • Marathi Digest in PDF
  • SSC/HSC Class Books in Marathi PDF
  • Downloadable PDFs - Marathi Education Board

📒 Marathi Study Material for Maharashtra Board

  • Notes in Marathi
  • Chapter-wise Question & Answer (Solutions) in Marathi
  • Important Questions for SSC – Marathi Medium
  • Summary Important Formulas
  • MCQ's, Question Bank, Sample Papers, Previous Year Paper for cxlass 6th to 12th Std for Maharstra Board

क्लास की बुक (पुस्तक), MCQ, नोट्स इन हिंदी

Download एनसीईआरटी सलूशन, सैंपल पेपर, प्रश्न पत्र इन पीडीएफ

CBSE, उत्तर प्रदेश, मध्य प्रदेश, बिहार, राजस्थान & हरियाणा Board हिंदी माध्यम

कक्षा 6 to 8 हिंदी माध्यम
कक्षा 9 & 10 हिंदी माध्यम
कक्षा 11 हिंदी माध्यम

State Board

यूपी बोर्ड 6,7 & 8
बिहार बोर्ड हिंदी माध्यम

CBSE Board

Mathematics Class 6
Science Class 6
Social Science Class 6
हिन्दी Class 6
सामाजिक विज्ञान कक्षा 6
विज्ञान कक्षा 6

Mathematics Class 7
Science Class 7
SST Class 7
सामाजिक विज्ञान कक्षा 7
हिन्दी Class 7

Mathematics Class 8
Science Class 8
Social Science Class 8
हिन्दी Class 8

Mathematics Class 9
Science Class 9
English Class 9

Mathematics Class 10
SST Class 10
English Class 10

Mathematics Class XI
Chemistry Class XI
Accountancy Class 11

Accountancy Class 12
Mathematics Class 12

Learn English
English Through हिन्दी
Job Interview Skills
English Grammar
हिंदी व्याकरण - Vyakaran
Microsoft Word
Microsoft PowerPoint
Adobe PhotoShop
Adobe Illustrator
Learn German
Learn French
IIT JEE

Study Abroad

Study in Australia: Australia is known for its vibrant student life and world-class education in fields like engineering, business, health sciences, and arts. Major student hubs include Sydney, Melbourne, and Brisbane. Top universities: University of Sydney, University of Melbourne, ANU, UNSW.

Study in Canada: Canada offers affordable education, a multicultural environment, and work opportunities for international students. Top universities: University of Toronto, UBC, McGill, University of Alberta.

Study in the UK: The UK boasts prestigious universities and a wide range of courses. Students benefit from rich cultural experiences and a strong alumni network. Top universities: Oxford, Cambridge, Imperial College, LSE.

Study in Germany: Germany offers high-quality education, especially in engineering and technology, with many low-cost or tuition-free programs. Top universities: LMU Munich, TUM, University of Heidelberg.

Study in the USA: The USA has a diverse educational system with many research opportunities and career advancement options. Top universities: Harvard, MIT, Stanford, UC Berkeley

Privacy Policies, Terms and Conditions, Contact Us
eVidyarthi and its licensors. All Rights Reserved.