MARK THE STATEMENT TRUE OR FALSE 1. Light is a form of energy. 2. Light is not an electromagnetic wave 3. Laws of reflection are trae only for plane mirror and not for curved mirror. 4. A book is a self luminous object. The speed of light changes when it moves from one medium into another. 6 Speed of light in vacuum is 3*10^ 11 m/s . 7. Light does not travel in straight line. 8. Opaque is a medium though which light cannot be propagated. 9. A virtual image cannot be obtained on a screen. 10 A convex mirror always forms a virtual and erect image. 11. A concave mirror can be used to obtained a parallel beam of light from a small lamp. 12. 13. Plane mirror is used in a solar cooker to reflect the sun light. If radius of curvature is 32 cm then the focal length of the concave mirror is 60 cm. 14. The radius of curvature of a concave mirror is 30 cm then focal length of this mirror is-15 cm. 15 Linear magnification of plane mirror is?
Answers
1. true
1. true2. false
(light is electromagnetic waves since it carries charged particles)
(light is electromagnetic waves since it carries charged particles)3. false
(light is electromagnetic waves since it carries charged particles)3. false (it is true for any reflecting surface)
(light is electromagnetic waves since it carries charged particles)3. false (it is true for any reflecting surface)4. false
(light is electromagnetic waves since it carries charged particles)3. false (it is true for any reflecting surface)4. false (it is non luminous because it reflects light from luminous object)
5. false
(it cannot be change it speed)
6. false
(speed of light in vaccum is 3×10⁸m/s)
7. false
( it may travels in straight line)
8. true
9. true
10 true
11 true
12
13.
14.
15 +1
i am not get the ans for 12 , 13, 14
and verfy other ans
Answer:
1. true
2.false
3.false
4.false
5.false
6.false
7.true
8.true
9.true
10.false