Invent and construct an optical device that USES a laser pointer and allows contactless determination of thickness, refractive index, and other properties of a glass sheet.

请利用一个激光笔发明并制造一个做的光学仪器，使其可以不接触地测量一个玻璃片的厚度、折射率以及其他属性。

youdao

Standing silently but amiably to one side, he would unbolt the magic boxes, hold the ropes, demonstrate the emptiness of beakers and pots, confirm the thickness of a sheet of glass before a near-naked girl would climb into a magic box and pass straight through it!

ECONOMIST: Ali Bongo | The