An object of height 2.5cm is places 20cm from a convex mirror of focal length 10cm. Calculate the height of its image.
A ray of light passes from air to water to glass to air. Given that the refractive index for light passing from air to water is \(\frac{4}{3}\) and air to glass is \(\frac{3}{2}\), calculate the refractive index of glass relative to water
