Light Book Back Questions & Answers, Exercises | Unit 6 | Class 9 | | Science | Samacheer Kalvi
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Light Book Back Questions & Answers, Exercises, Solutions, Tests, Quizzes, Videos and Podcasts for Class 9 | Unit 6 | | Science | Samacheer Kalvi – English Medium
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00:00 Introduction
00:10 Choose the correct answer
01:56 True or false
03:22 Fill in the blanks
04:11 Match the following
04:59 Assertion and reason
Questions answered in this video –
1. A ray of light passes from one medium to another medium. Refraction takes place when angle of incidence is
2. _____ is used as reflectors in torchlight.
3. We can create enlarged, virtual images with
4. When the reflecting surface is curved outwards the mirror formed will be
5. When a beam of white light passes through a prism it gets
6. The speed of light is maximum in
7. The angle of deviation depends on the refractive index of the glass.
8. If a ray of light passes obliquely from one medium to another, it does not suffer any deviation.
9. The convex mirror always produces a virtual, diminished and erect image of the object.
10. When an object is at the center of curvature of concave mirror the image formed will be virtual and erect.
11. The reason for brilliance of diamonds is total internal reflection of light.
12. In going from a rarer to denser medium, the ray of light bends _____________.
13. The mirror used in search light is _____.
14. The angle of deviation of light ray in a prism depends on the angle of _______.
15. The radius of curvature of a concave mirror whose focal length is 5cm is _______.
16. Large _________ mirrors are used to concentrate sunlight to produce heat in solar furnaces.
17. Ratio of height of image to height of object
18. Used in hairpin bends in mountains.
19. Coin inside water appearing slightly raised.
20. Mirage
21. Used as Dentists mirror.
22. (A): For observing the traffic at a hairpin bend in mountain paths a plane mirror is preferred over convex mirror and concave mirror… (R): A convex mirror has a much larger field of view than a plane mirror or a concave mirror.
23. (A): Incident ray is directed towards the center of curvature of spherical mirror. After reflection it retraces its path… (R): Angle of incidence (i) = Angle of reflection (r) = 0 .