1) If Angle a is 25o Angle b is_f=x 10Hz7) Full-length mirrors used while dressi

1) If Angle a is 25o Angle b is_f=x 10Hz7) Full-length mirrors used while dressing are:xinchesIf the index of refraction of a lens is 1.5 how fast does light travel in the lens?x 10m/sec.10) Four beats per second are heard when an unknown tuning fork and a 240 Hz tuning fork are struck simultaneously. This same unknown tuning fork and a 250 Hz tuning fork are struck. Six beats are heard. Its exact frequency:11) Four beats per second are heard when an unknown tuning fork and a 240 Hz tuning fork are struck simultaneously. What are the two possible frequencies of the tuning fork?m