Q37 of 117 Page 10

State Snell's law

Snell's Law relates the indices of refraction of the two media to the directions of propagation in terms of the angles to the normal.

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35 Two thin lenses of power +3.5 D and –2.5 D are placed in contact. Find the power and focal length of the lens combination. 36 How can you distinguish between a real image and a virtual image? 38 How image can be located which is formed by a plane mirror? 39 What is the relation between Speed of light in a medium and refractive index.