The velocities of light in air and glass are 3.0 x 10\(^8\)ms\(^{-1}\) and 2.0 x 10\(^8\)ms\(^{-1}\) respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?
The power of the lens is +2.5D. What is the radius of the curvature?
Which of the folowing statements about light travelling from one material medium to another is not correct?
The secondary pigments consist of?
A person standing waist-deep in a swimming pool appears to have short legs because of light?
