A plate of crystal quartz is cut with its faces perpendicular to the optic axis. It is found that this plane exactly annuls the rotation of the plane of polarisation ofsodium light produced by a 30 cm length of a 18^(@) solution of lactose. Calculate the thickness of the quartz plate. Given 's' for lactose =5253^(@), 1 mm of quartx rotats the plane of polarisation of sodium light by 21.71^(@).

A plate of crystal quartz is cut with its faces perpendicular to the o

1.	A plate of crystal quartz is cut with its faces perpendicular to the optic axis. It is found that this plane exactly annuls the rotation of the plane of polarisation ofsodium light produced by a 30 cm length of a 18^(@) solution of lactose. Calculate the thickness of the quartz plate. Given 's' for lactose =5253^(@), 1 mm of quartx rotats the plane of polarisation of sodium light by 21.71^(@).
Answer» ANSWER :1.31cm

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