How must light travel out of a substance if it is not going to be refracted?
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We can bend light away from the normal by making the light to enter from a denser medium to a rarer medium.
Light will not refract if it travels at the right angles to the surface of the substance.
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An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
A ray of light is incident on a convex mirror as shown. Redraw the diagram and complete the path of this ray after reflection from the mirror. Mark angle of incidence and angle of reflection on it.