The thickness of a glass plate is measured to be 2.17 mm, 2.17 mm and 2.18 mm at three different places. Find the average thickness of the plate from this data.

Q. In YDSE experiment a glass plate of refractive index 1.5 is placed infront of one of the slits. Minimum thickness 't' of this glass plate so that intensity of light at position of central maxima [before glass plate] remains unchanged is

Q. Two identical plates of different metals are joined to form a single plate whose thickness is double the thickness of each plate. If the coefficients of conductivity of each plate are 2 and 3 respectively, then the conductivity of the composite plate will be

Q. Light travels through a glass plate of thickness $t$ having refractive index $\mu$. If $c$ be the velocity of light in vacuum, time taken by the light to travel through this thickness of glass is :

Q. In YDSE, when a glass plate of refractive index $1.5$ and thickness $t$ is placed in the path of one of the interfereing beams (wavelength $\lambda$), intensity at the position where central maximum occurred previously unchanged. The minimum thickness of the glass plate is

Q. Light travels through a glass plate of thickness and having refractive index $n$. If $c$ is the velocity of light in vacuum, the rime taken by the light to travel this thickness of glass:-