Does a light ray reflect the refract from a lens?
A ray of light passes undeviated after refraction from a thin lens when the ray is incident at...................
A ray of light passes undeviated after refraction from a thin convex lens when the ray is incident at __.
A ray of light travelling in water falls at right angles to the boundary of a parallel-sided glass block. The ray of light : (a) is refracted towards the normal (b) is refracted away from the normal (c) does not get refracted (d) is reflected along the same path.