Name a property of sound which is(i) similar to the property of light.(ii) different from that of light.Why do some people have hearing impairment ? How do they communicate with others ?

(i) The property of sound similar to light is that in both reflection takes place. (ii) Sound can travel around comers but light cannot. Some people suffer from hearing impairment because their ear drum is damaged or absent. This can be from birth or may occur later on. Such people communicate with “sign language”. They can also use “hearing aids”.