Class 10 Science Chapter 1 Light – Reflection and Refraction Objective Questions

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1. Q1. Which mirror is used as a rear-view mirror in vehicles?

   (A)Concave mirror(B)Convex mirror(C)Plane mirror(D)Cylindrical mirror

2. Q2. The SI unit of the power of a lens is

   (A)Metre(B)Watt(C)Dioptre(D)Joule

3. Q3. The focal length of a plane mirror is

   (A)Zero(B)Infinite(C)25 cm(D)Negative

4. Q4. If the angle of incidence is 30°, the angle of reflection is

   (A)60°(B)30°(C)90°(D)15°

5. Q5. A concave lens always forms an image that is

   (A)Real and inverted(B)Virtual and magnified(C)Virtual, erect and diminished(D)Real and magnified

6. Q6. The power of a lens of focal length 50 cm is

   (A)+2 D(B)+0.5 D(C)+5 D(D)+20 D

7. Q7. Light travels fastest in

   (A)Water(B)Glass(C)Vacuum(D)Diamond

8. Q8. Which mirror is used by dentists to see a magnified image of teeth?

   (A)Convex mirror(B)Plane mirror(C)Concave mirror(D)None of these