Dispersion occurs when white light passes through a glass prism because of the?
If a concave lens of focal length 12cm is used to produce a real image four times the size of the object, how far from the lens must the object be placed?
A transparent rectangular block 5.0cm thick is placed on a black dot. The dot when viewed from above is seem 3.0cm from the top of the block calculate the refractive index of the material of the block.
The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called?
Total internal reflection will not occur when light travels from
