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                                                    Osb India Optics DPP Class 10  1. In reflection of light the angle of reflection is a) equal to angle of incidence b) greater than angle of incidence c) less than angle of incident d) Both (a) &(b) 2. When light travel from  air to glass it a) bend away from normal b) bend towards the normal c)does not bend d)none of these 3. Refraction causes due  to a) change in wavelength of light b) change in speed of light c) change in frequency of light d) Both (a) & (c) 4. The correct relationship between refractive index and speed of light is a) u=c/v b) u = v/c c) u=v×c d) u=v+c 5. The speed of light in water is 2.25 ×10^8 m/s then refractive index of water is a) 2.32 b)1.03 c)1.33  d)2.33 6. The refractive indices of kerosene oil, water and turpentine oil are 1.44, 1.33, 1.47 respectively. In which of these material light travel faster? a) Kerosene oil b) Turpentine oil c) water d) Equal in all 7. A coin dipped in water s

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