The mirror used in automobiles to see the rear field of view is
A) concave
B) convex
C) plane
D) none of these
Correct Answer:
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Q9: Which of the following types of waves
Q10: Waves produced by supersonic jet planes are
A)shock
Q11: Echo is produced due to
A)reflection of sound
B)refraction
Q12: SONAR is based on the principle of
A)echo
B)resonance
C)reverberation
D)any
Q13: Which of the following frequencies of sound
Q15: The mirror used in search lights is
A)concave
B)convex
C)plane
D)none
Q16: Shaving mirrors are
A)convex mirrors
B)concave mirrors
C)plane mirrors
D)none of
Q17: The laws of reflection are true for
A)the
Q18: When the object is at focus of
Q19: Which of the following is a non-luminous
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