Question

1. What is the power of a plane mirror?
2. When the angle of incidence is 90°. What is the angle of refraction?
3. What is the value of speed of light in free space?
4. What is the power of sunglasses?
5. What causes the burning of paper when sunlight, passes through a lens, strikes it?
6. For image construction by ray diagram method, how many rays are sufficient?
7. For rear view, what type of mirror is used in vehicles?
8. Which colour of light reflected by an object will make it appear blue?
9. Based on which theory of light do we say light has dual nature?
10. Which lens has real focus?​

Answer 1

Answer:

Explanation:

1). power is 1/focal length = 1/ infinity = 0 (as limit of 1/x as x tends to infinity is 0)

2). angle of incidence = angle of reflection = 90. this means that light ray grazes the surface

3). 3*10^8 m/s

5). when the light passes through the lens many rays converge at a point and all the heat energy is concentrated on that point only as a result the paper burns due to extra heat

6). 2

7). convex mirror

10). convex lens

Answer 2

Answer:

power of plane mirror- because focal length of plane mirror is at infinity it has power 0

angle of refraction- when the angle of incidence is 90° angle of recfraction will remain undeviated

Power of sunglasses- is 0