Success is the sum of small efforts repeated day in and day out.— Robert Collier

Light & Sound — quick quiz

5 real Bihar Police questions on Light & Sound. Instant scoring and solutions, no signup — see where you stand in ~3 minutes.

Question 1 of 5

MEDIUM

A concave mirror is used as a shaving mirror. If a person's face is placed 15 cm from the mirror and the image formed is erect and magnified 2 times, what is the focal length of the mirror?