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An object is immersed in a fluid. In order that the object becomes invisible, it should
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Important Questions on Ray Optics
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The angle of a glass prism is and its refractive index is The angle of minimum deviation will be -
HARD
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A ray of light passes through equilateral Prism such that angle of incidence is equal to angle of emergence and the later is equal to th of Prism angle. The angle of deviation is
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Prism angle of a prism is . Their refractive index for red & violet colour is & respectively. Then dispersive power will be
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If the refractive indices of crown glass for red, yellow and violet colours are and respectively, and for flint glass these are and , respectively, then the dispersive powers for crown and flint glass, respectively, are
MEDIUM
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A thin prism with angle and made from glass of refractive index is combined with another thin prism made from glass of refractive index to produce dispersion without deviation. The angle of prism is
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The angle of minimum deviation for a prism is and the angle of prism is . The refractive index of the prism material is:
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The angle of a prism is ‘’. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index , of the prism is:
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A ray falls on a prism and travels as shown figure. The minimum refractive index of the prism material should be
